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These devices can be restarted individually to minimize the impact on the environment. Determines whether the Expressway's B2BUA preserves or rewrites the parameters in SIP requests routed via this zone. Select Append CA Certificate. However, if you review the inbound calling diagram (from the Cisco Webex Hybrid Call Design Guide), the behavior makes more sense as shown in the image. (Services > Settings (Under Hybrid Call card) > Upload (Under Certificates for Encrypted Calls)), If you pay close attention to the wording about the Certificates for Encrypted SIP Calls, you see this: 'Use certificates provided from the Cisco Collaboration default trust list or upload your own. Cisco Webex and the enterprise begin sending and receiving media. Almost every call failure involving outbound on-premises to Cisco Webex results in the same reported symptom: "When I call from my Unified CM-registered phone to another user who is enabled for Call Service Connect, their on-premises phone rings but their Cisco Webex app does not." The SIP Request URI will be the Cisco Webex User's SIP Address, The SIP FROM field will be formatted to have the Calling Party listed as "First Name Last Name" , Whether the Expressway-E receives the INVITE, Whether Search Rule logic passes the call to the Hybrid DNS Zone, Whether the DNS Zone performs the DNS Lookup and on the correct domain, Whether the system attempted and correctly established a TCP Handshake for Port 5062, Whether the Mutual TLS Handshake succeeded, The Called user's Cisco Webex app presented Join button, The Calling phone was playing a ring back, The Called user's on-premises phone was ringing, The Called user's Cisco Webex app never rang, The Expressway-E never attempted to send the INVITE to Cisco Webex. (Example: 64.102.241.236:5062). At that point, you can then issue the full SRV record you want to look up. If you couple this with the statements from the Deployment Guide for Cisco Webex Hybrid Call Services, you would find that the Modify DNS Requestmust be set to On and the Domain to search for should be set to callservice.ciscospark.com. To resolve this, you'll need to follow these steps: The general rule of thumb with Search rules is the more specific the Pattern string, the lower it can be placed in the Search rule priority list. The hostnamel2sip-cfa-01.wbx2.com resolves to 146.20.193.64. In the My Webex Pro column, check the My Reports box. Modify DNS request (Translates toDnsOverride Override in xConfig). You can clearly see that the User-Agent is Cisco-CUCM11.5 which means that the message was generated by theUnified CM. The documentation set for this product strives to use bias-free language. At this point, it is worth looking into how the considered search rule (to DNS) was implemented so that you can better understand if it is impacting the use of the Webex Hybrid Search rule. However, the lack of SSL error in the diagnostic log is an important data point. 11, G.722, or AAC-LD. It's important to understand what type of traffic you're most interested in so that you can filter Wireshark to display just that. May 11, 2020 21:37. When looking at the third hit in the logs for the Call-ID, you can see that the Expressway-E immediately sends a403 Forbiddento the Expressway-C. To understand why the Expressway-E denied this call and sent a 403 Forbidden error to the Expressway-C, you want to analyze the log entries between the 403 Forbidden and the original SIP INVITE that entered into the Expressway. From a packet capture perspective, you'll see that the Expressway-E presents its certicate to Cisco Webex. In order to use Check pattern to test the Hybrid Call Service Connect Route header search rule routing, follow these steps: If the search rules on the Expressway are configured correctly, you can expect to see the Results return a Succeeded message. 22 6 Unable to register SX80 to Webex Control hub - 'The activation service requires an encryption option key' Go to solution Knowlesy14 Beginner Options 08-07-2018 06:00 AM - edited 03-18-2019 02:17 PM I'm trying to register a SX80 via the Webex Control Hub (admin.webex.com). Webex App takes your privacy seriously. We would like to show you a description here but the site won't allow us. Refer the Enable Hybrid Call Service Connect for Your Organizationsection of the Cisco Webex Hybrid Call Service Deployment Guide or the Cisco Webex Hybrid Design Guide. The servers that process these messages must be configured in such a way that they can accept a large packet. Now when analyzing this particular call, you can focus on the Expressway-E because you determined (using Search History) that the call has made it this far. Socket Failure: Expressway-E is not Listening on Port 5062, Issue 4. Cisco Webex then rejects this TLS handshake with an Unknown CA error message as shown in the image. At that point, you can then reproduce the problem. you can make the determinationthat theCPL is rejecting the call. Expressway-E maps the inbound connection through the Cisco Webex Hybrid DNS Zone. The number that comes after the "Rule" will increase based on the search rule that was created first being marked 1. Expressway-E and the Cisco Webex environment begin a Mutual handshake, The Cisco Webex environment passes the call onto User B's available Cisco Webex app. The route header is populated based on the information that the Call Service Aware (Expressway Connector) portion of the solution delivers to Cisco Webex. Additionally, if they need more information, you can take a capture off the outside interface of the edge device and/or firewall for further proof. In later releases of Unified CM, the value size allowed for a SIP message have been increased however this value is only set on new installs, not upgrades. By analyzing these log entries, you can typically see all the logic decisions that are being made. To identify the Zone in the xConfiguration, you can simply use the name recorded in the Via linethat gets printed in the logs. This information can also be captured through the web interface of the Expressway-E. See the steps below to gather this information, 2. When this was checked in this environment, there was no firewall configuration present. At first glance, you may think something is wrong with the Expressway-E certificate. Below is a snippet of what you could expect from the Expressway-E diagnostic logging perspective. To preserve the call-type=squared value in the Contact header of the SIP INVITE, you must ensure that the Expressways support SIP parameter preservation for all Zones involved in handling the call: ###############################################, Note: In this example scenario it was the Webex Hybrid Traversal Server zone on the Expressway-E that was misconfigured. Since the test has failed you can click the View test results link to check the details as shown in the image. Take a closer look at the packet capture provided with the Expressway-E diagnostic logging, you can see that the Certificate Unknown error is getting sourced from the direction of Cisco Webex as shown in the image. In some new deployments of Hybrid Call Service Connect, the signing of the Expressway-E certificate is overlooked or it's believed that the default server certificate can be used. Now that the call is being sent to a DNS Zone, you can review the DNS SRV Lookups that are occurring on the Expressway-E. All of this is entirely normal. If so, you will likely want to start your investigation there. The Expressway-E is not listening for Mutual TLS traffic and/or not listening for traffic over port 5062. Cisco Webex sends an inbound INVITE w/ SDP that is too large. The feature breaks down into a three step process: If authentication is not successful, this means that the certificate validation failed. This can happen intentionally or unintentionally by the use of custom and/or default region settings on the Unified CM. Now you can focus on the DNS Lookup logic. The user's credentials are missing or incorrect. You can see that the dialog itself completes with an ACK. You must switch the Preloaded SIP routes support to On. For Hybrid Call Service Connect, you can also test that the Unified CM Cluster FQDN is going to match the Pattern string that you set upfor the Unified CM cluster FQDN. By searching the Expressway-E diagnostic logs for "TCP Connecting" and searching the line item with the tag "Dst-port=5062", you can determine if the connection establishes. The call thus enters into the Default Zone andis checked and routed according to the search rules provided for business-to-business scenarios, if business-to-business is configured on Expressway-E.. 2. is including its full chain involved in the signing. 1 Reply Cole Callahan Cisco Employee Options 03-31-2022 01:57 PM Is this something you had access to before? The Contact header has the call-type=squared value present. The above recommendation was pulled directly from the Cisco Webex Hybrid Design Guide. If the call originated by an on-premises phone, you can expect that the Cisco Webex app would not ring. The first assumption is that the firewall is blocking the traffic. The problem is that with this design, the Directory URI is also assigned to his CTI-RD or Cisco Webex RD. Open the Participants panel and locate the attendee that you want to make a host. If the Expressway-E does not trust the Cisco Webex signed certificates, you can expect that the Expressway-Ecan reject the certificate immediately after the handshake completes. This capture filtered by using tcp.port==5062 as the applied filter as shown in the image. This IP address is going to be the public IP address of the on-premises Expressway-E. If the Task List pane is collapsed, you can see a popover at the bottom-right corner of the desktop to accept the request. Choose the Internal CA and Expressway-E certificates. In this particular scenario, the call originated from an on-premises phone. Now that you confirmed the TCP Connection established, you can analyze the mutual TLS handshake that happens immediately after. Is the Expressway-E signed by a Public CA that Cisco Webex trusts? When reviewing this configuration, you can see the following is configured, Destination:.*@dmzlab\.call\.ciscospark\.com.*. Alias: %Request URI in the initial INVITE% (Ex: pstojano-test@dmzlab.call.ciscospark.com), The pattern string would match the Cisco Webex Request URI, The called user's Cisco Webex app presented a Join button, The calling phone was playing a ring back, The called user's on-premises phone was ringing, Select the rule that was setup for the Cisco Webex Hybrid Call service, Cisco Webex sends an inbound INVITE w/ SDP that offers G.7. The call enters into the Default Zone and is routed according to the search rules provided for business-to-business scenarios, if business-to-business is configured on Expressway-E. Like the other scenarios, you must use both the diagnostic logging and packet captures to determinewhat this failure looks like, then use the packet capture to see which side is sending the RST. As you can see in the packet capture that was obtained from the Expressway-E, the traffic over tcp port 5062 is not being blocked by the firewall but is in fact arriving. It's important to know that when a certificate is uploaded to the Cisco Webex Control Hub, that certificate takes priority over what certificate and chain the Expressway presents during the TLS handshake. The fact that the Alias could be routed (True), Destination information (alias being routed), Search Rule being matched (Hybrid Call Service Inbound Routing), The zone that the call would be sent to (CUCM11). Issue 1. To explain this, consider an example. This Expressway capability gives an engineer a great detail of information for all the logic decisions the Expressway is going through as the call passes. If this value is not present, the inbound call fails. Choose the CA certificate that was involved in the signing of the Expressway-E.Step 5. This can be spotted in the Expressway-E logging by these log entries: The Expressway error message can slightly mislead because it refers to a self-signed certificate in the certificate chain. If your network is live, ensure that you understand the potential impact of any command. When reviewing this SIP INVITE that is being sent from the Expressway-E to the Expressway-C, note that the Contact header is missing the call-type=squared. Workaround: Click before closing the app window. Now looking at what is unique about the initial INVITE what can be noticed is it only contains G.729. Once you have identified the SIP INVITE for the Outbound call, you can then locate and copy the SIP Call-ID. Like all of the other scenarios, you can use the CUCM SDL traces along with Expressway-C and E diagnostic logs. As you can see in the example the TLS Verify Subject Name is set to calllservice.ciscospark.com instead of callservice.ciscospark.com. If search rule Neighbor wasn't matched, it will still continue to Search Rule DNS (50) and consider that last. In the Call Service Connect section verify, If the record has been entered correct, click. This troubleshooting guide covers Firewall/NAT considerations along with Expressway design in both Appendix 3 & 4. Review this documentation thoroughly. The Expressway-C passes this onto the Unified CM and Unified CM closes the TCP socket then the SIP dialog will time out. From the root of the Expressway, if you issue netstat -an | grep ':5062' , you should get some output similar to what you see below. Symptom: Webex Control bar with open Invite panel is splitting in two parts between screens, displaced or missing a part in Webex Support.Conditions: When you start a a web ex support session om device with external monitor and request desktop view from participant. what certificates are being passed to determine if they are correct. By design, the Expressway-E only sends its certificate during a TLS handshake despite being signed by a public CA. The Expressway will do this based on Search Rules. Now that the call is being sent to a DNS Zone, you can review the DNS SRV Lookups that are occurring on the Expressway-E. All of this is entirely normal. They will general look for a log line item such as this as shown in the image. For more information about uploading your Expressway-E certificate in the Cisco Webex Control Hub, checkthis section of the Hybrid Call Deployment Guide. Learn more about how Cisco is using Inclusive Language. In this SIP INVITE, you can gather up the Request URI (pstojano-test@dmzlab.call.ciscospark.com), the Call-ID (991f7e80-9c11517a-130ac-1501a8c0), From ("Jonathan Robb" ), To (sip:pstojano-test@dmzlab.call.ciscospark.com), and User-Agent (Cisco-CUCM11.5). you can use commonly used naming values such as "Webex" to better locate the Search Rule. In this situation, both of these conditions are met. The first notification (toast) is from the person who is initiating the call (calling party) from the Cisco Webex side. Additionally, this document assumes that the Expressway connector host and Hybrid Call Service activation were completed. In order to resolve this issue, the TLS Verify Subject Name must be modified: Note: See thefor baseline logging behavior. If you look closely, you see that the SRV record response is providing a server address and port 5061, not 5062. In order to troubleshoot this scenario, you'll find it helpful to understand both the call flow and logic that occurr when this type of call is being placed. (, If the Expressway-E does not use a publicly signed certificate, was the Expressway certificate along with any root and intermediate certificates uploaded to the Cisco Webex Control Hub (. If you attempt to troubleshoot this situation from an Expressway-E diagnostic log perspective, you do not see any trafficfrom Cisco Webex. With this information, the next logical step the Expressway will take is to send a TCP SYN packet to 146.20.193.64 so it can try to setup the call. For this particular behavior, the logging patterns can differ based on the direction of the call and if the Unified CM wasconfigured to use Early or Delayed Offer. 5. Both of these configurations would be done on the Expressway-C. ), if Cisco Webex doesn't trust the Expressway-E certificate, you must see some type of SSL disconnect reason. Because video has become more prevalent within the enterprise, the size of SIP messages that contain SDP has grown substantially. With the use of the diagnostic logs from the Expressway, you can look for the attempted Mutual TLS handshake. Keep in mind that it is entirely possible for the SIP parameter preservation value to be set to Off on the Webex Hybrid Traversal client or CUCM neighbor zones. The original SIP URI is not affected. How to Change Host Role. From the list, selectSSL,clickApplyandclose the window. To attempt to answer that question, you can look for possible configuration issues on the Expressway-E Webex Hybrid DNS Zone. To find the search rules configured on the Expressway from the xConfiguration perspective, you can search for "xConfiguration Zones Policy SearchRules Rule" By doing this, you'll see a list of Search Rule configuration for each Search Rule created on the Expressway. To troubleshoot this particular condition, you can use the techniques in the "Port 5062 is blocked inbound to the Expressway" scenario above. In the xConfiguration the, the domain used for the public SIP SRV address, Configure the SIP Destination to be formatted as. Configure a public SIP SRV address for the Expressway-E on the site they use to host public domain names. The Expressway-C sends this message to Unified CM but Unified CM is configured to only allow G.729 for this call. Compared to what's been documented in the Cisco Webex Hybrid Call Service Deployment Guide, you can see that the Source and Destination were configured backwards. From the CLI perspective, when you runnetstat -an | grep ':5062' , the output looks like this: Additionally, the web UU does not show the Mutual TLS port listed under Local inbound ports. Is callservice.ciscospark.com present in the Subject Alternate Name field of the Cisco Webex certificate? From the illustration, you can see the Alice is calling Bob from her Cisco Webex app and that the call is being forked down to the premises. On many call control servers, the default values are fine. The Device Pool contains the mappings to the Regions. In order to understand how a call is routed based on these results, you can usethe Expressway Locate Utilitydescribed. By default, everything is set to INFO which captures almost everything you need to diagnose a problem. 3. At first, this behavior seems peculiar. The reason this is successful is that thisAlias (cucm.rtp.ciscotac.net) matches the Prefix pattern string of (cucm.rtp.ciscotac.net). In the scenario documented above, the following was determined: Expressway-C Trunk Region: ReservingBandwidth. You can see above it was called egress-zone=HybridCallServiceTraversal. If Alice were to call Bob, the call would route to Alice's Unified CM Home Cluster FQDN (us-cucm.example.com). Resolution Navigate to Wireshark: Certificate > Extension > General Names > GeneralName > dNSName: callservice.ciscospark.com. Repeat steps for all CA certificates involved in the signing of the Expressway-E certificate (Intermediate, Root).Step 7. The parameter Cisco Webex inserts into the SIP INVITEis called "call-type=squared" and this value is entered into the Contact header. Below is a sample snippet of the INVITE coming inbound to the Expressway-E from this scenario. The scenarios below show you how to use the diagnostic logging to identify a CPL misconfiguration. Now that you know what you should see, you can compare that to the current environment. By doing this, the Webex environment will not attempt an SRV lookup but rather connect directly to the%Expressway_Pub_IP%:5062. On the sharing toolbar, select Give control. for using Search History and tips for identifyinga call in the diagnostic logs. Expressway Search rule misconfiguration, Bidirectional: Cisco Webex to On-Premises or On-Premises to Cisco Webex. The first step to analyze this traffic from the Expressway diagnostic perspective is to search for TCP Connecting. If you focus on the xConfiguration of the Expressway-C, you can start by looking for the Traversal Client zone for Webex Hybrid. Note: If the SIP SRV record you would like to use is already being leveraged for business-to-business communications, we recommend specifying a subdomain of the corporate domain as the SIP discovery address in Cisco Webex Control Hub, and consequently a public DNS SRV record, as follows: Service and protocol: _sips._tcp.mtls.example.comPriority: 1Weight: 10Port number: 5062Target: us-expe1.example.com. This document describes the CiscoWebex Hybrid Call Service Connect solution that allows your existing Cisco call control infrastructure to connect to the Cisco Collaboration Cloud so that they can work together. This Webex zone prepopulates the configuration of the zone required for communication out to Webex. Because we know that the call is getting out to Cisco Webex, the log analysis starts on the Expressway-E. When you adjustthe SIP TLS port to 5062 in the Wireshark preferences, you can then see all the details that surround the handshake, which includes the certificates. You can click specific order numbers to view the status (in progress, successful, or failed), and search phone numbers . . Otherwise, you would seean error like "self signed certificate in certificate chain". The steps below illustrate how you can adjust the logging levels of the developer.ssl module which is responsiblefor providing information for (mutual) TLS handshakes. The problem is immediately after the dialogcompletes there is a BYE that comes from the direction of the Expressway-C as shown in the image. As before, you should reference the. Is your Webex app up to date? For more information on the CPL implementation for Webex Hybrid refer to the Cisco Webex Hybrid Design Guide. Cisco Webex has a full list of public CAs that it trusts. Here is an example of a successful Check pattern test as shown in the image. Step 2. Decide who can see when you're available and what your status is. Switch Preloaded SIP routes support Off if you want the zone to reject SIP INVITE requests containing this header. From the Expressway-E logging, you can review to see if this is happening. The Expressway-E was the responsible party for making the logic decision to reject the call with a 404 Not Found error. Looking through the Expressway-C logs for this particular condition helps you understand the message flow. WBS41, 42 For: User Subscribe January 20, 2023 | 67119 view (s) | 380 people thought this was helpful Provide or request remote control in Webex Meetings, Webex Events (classic), Webex Webinars, and Webex Training sessions This can useful for Training sessions, collaborating on a document with someone, or while troubleshooting an issue. Now you can focus on the DNS Lookup logic, With this understanding, you can take a look at the Search Rule priorities between the ", Find the Webex Hybrid Search rule and click it. Log in to the Expressway server(Must be done on both the Expressway-E and C). Register Expressway-C connector hosts to Cloud . Scroll to the Call Service Connect section and look under the Certificates for Encrypted SIP Calls to see if undesired certificatesare listed. You will find that the Hybrid Connectivity Test tool and any other tool used to check port connectivity will fail. Having this data in addition to the Expressway diagnostic logs/pcaps not show any connection attempts, you now have enough evidence to investigate the firewall ACL/NAT/Routing configuration. Below are samples of the two notifications that are received as shown in the image. A few line items later, the Cisco Webex environment rejects the certificate with a Certificate Unknown error as shown in the image. If you don't have any of this information, you can search on "INVITE SIP:" which locates all SIP calls running over the Expressway. In order toconfirm the configuration of this value, you can go to the Webex Hybrid DNS Zone that was configured for the solution. The question to answer is what could be causing this stripped header. 4. Step 1. This section shows the Expressway performing certificate verification and the mapping to the Webex Hybrid DNS Zone. If you use your own, ensure the hostnames are on a verified domain.' This issue happens on both inbound and outbound calls to Cisco Webex. After reviewing the xConfiguration from this scenario, you can see that Search Rule 6 is the correct rule to pass the call out to Cisco Webex. If you try to search for TCP Connecting, you would not see any connection attempts for the Dst-port=5062, nor would you see any subsequent MTLS handshake or SIP Invite from Cisco Webex. Below is a sample of what you can expect in the Expressway-E logging during the TLS handshake: Take a look at this from the Wireshark perspective you can see here that the Expressway-E presents its certificate in line item 175. You can also request access to someone else's screen when they're sharing. This particular condition can often occur when you deployed the Expressway solution from scratch and you do not have the Expressway-E certificate signed by a public CA initially. So, Unified CMwill reject the call due to no available codec. Learn about the basics of the Webex REST API, such as pagination, content attachments, message formatting, and more. Below is a sample of the search rule logic that the Expressway was performing. It's possible that the issue could be related to a firewall ACL, NAT, or routing misconfiguration. The new Device Pool had a Region set to RTP-Infrastructure, therefore the new region relationship between the Cisco Webex-RD and Expressway-C trunk was RTP-Devices and RTP-Infrastructure. Unified CM closes the TCP socket then the SIP dialog will time out. The more likely cause in this scenario is some type of intermediary device (firewall, IPS, etc) is not allowing the traffic out. Configure a hostname that will resolve to the public IP address of the Expressway-E. Configure the SIP Destination to list the domain used for the SIP SRV addresscreated in Step 1. Is the Expressway-E certificate and any certificates involved in the signing of the Expressway-E certificate manually uploaded to the Cisco Webex Control Hub (. The Expressway-E's firewall functionality exists under System > Protection > Firewall rules > Configuration. At this point, you've isolated the problem to a misconfiguration of the Expressway-C Traversalclient zone configuration. With this understanding, you can take a look at the Search Rule priorities between the "to DNS" and"Webex Hybrid - to Webex Cloud" rules. If Search Rule DNS was matched, the search would stop regardless of whether there was another Search Rule with a priority higher than 50, because the Pattern behavior was set to Stop. In order to troubleshoot this issue, you first have to determine answers to these questions: In this particular condition, the solution was not to use the Cisco Webex Control Hub to manage the Expressway-E certificates. Given that the Pattern behavior (Progress) is set to Stop, the Expressway-E never considers the Webex Hybrid - to Webex Cloud rule and the call ultimately fails. Given the evidence, consider possible reasons for why the Expressway-E would RST the packet. In Control Hub, select Users. This will ensure that the firewall is not manipulating the message in any way. This value matches the Subject Alternate Name of the Webex certificate that is presented during the Mutual TLS handshake and allows the connection and inbound mapping to the Expressway to succeed. Locate the packet that is sourced from the Webex server address and has Certificate printed in the Info section. It can take up to 15 minutes to hide your availability and custom status. Search for the Device Pool used for the Expressway-C SIP Trunk. To better understand what these values do, you can use the Expressway Web UI to look up the definition of the values. Based on the log snippet above, you can see that the Expressway-E parsed through four Search Rules, however only one (Webex Hybrid - to Webex Cloud) was considered. Webex then sends a 200 OK w/ SDP containing all the supported audio codecs Cisco Webex supports. 2. To better understand the rule configuration, you need to log in to the Expressway-E and navigate to Configuration > Call Policy > Rules as shown in the image. Note: if this option is missing or greyed out, contact Cisco Webex Sales for further assistance. At this point, you determined that the Expressway-E server certificate needs to be signed by either a Public CA or an Internal CA. At this point, if further isolation is required, you could take a packet capture off the outside interface of the firewall. When this condition is met, you can see an error similar to this within the diagnostic logging: If you use Wireshark to analyze this certificate handshake, you can find that after Cisco Webex presents its certificate, the Expressway RSTs the connection shortly after as shown in the image. Here is a snippet of the initial INVITE out to Cisco Webex. Determine if there is a Region relation between both regions that are using G.729. Most people will then double check the diagnostic logging from the Expressway-E to determine if they can see the TCP connection trying to establish. As you can see in the code block above, the nslookup command was initiated then the server is set to 8.8.8.8 which is a public Google DNS server. 2. Some people think that this is possible because the Cisco Webex Control Hub lets you load a custom certificate into the portal. The way Cisco Webex handles this situation is that it cancels the particular call leg. Search for Type SIP and IP port 5062. Register Expressway-C connector hosts to Cloud. Double-click the saved file to open the certificate as shown in the image. Additionally, if we check the definition of the Preloaded SIP routes support we can see clearly that the Expressway-C should REJECT a message if this value is set to Off AND the INVITe contains a route header: "Switch Preloaded SIP routes support Off if you want the zone to reject SIP INVITE requests containing this header.". This is normal behavior. This option is primarily intended for use with Cisco Webex Call Service. When you analyze the Mutual TLS handshake, first filter the capture by tcp.port==5062. The real zone name from the xConfiguration perspective would have spaces and is formatted at Hybrid Call Service Traversal. Here are the steps for how to pull the Cisco Webex certificate that is presentedat a mutual TLS handshake. The intermediary is signed by a root certificate authority that has a common name of QuoVadis Root CA 2as shown in the image. Consider the case where the Expressway-E checks the certificate for the callservice.ciscospark.com SAN but doesn't find that. When this name is printed into the Via line of the SIP Header, the spaces are removed. 3CX Support Joined May 10, 2016 Messages 11,157 Reaction score 1,364 Mar 27, 2017 #2 Hello @craigreilly Please note that the the organiser cannot request for remote control from the user joining the meeting. As noted above, Cisco Webex will attempt to connect to the on-premises Expressway by performing an SRV lookup based on the configured SIP Destination that is listed in the Hybrid Call Service Settings page in the Cisco Webex Control Hub. When requesting a list of resources the max query parameter may be used to control the number of items returned per page. This means that the Mutual TLS handshake that occurs over port 5062 will not happen and a separate port is used for signaling between the Expressway and Cisco Webex. Since Hybrid Call Service Connect runs over the same Expressway E & C pair as other solutions such as Mobile and Remote Access and Business to Business calls, issues with the other solutions can affect Hybrid Call Service Connect. Issue 2. Use this procedure to register Expressway-C resources to the cloud.. After you complete the registration steps, the connector software is automatically . Another quick way to understand how far the call is getting within your on-premises environment is to use the Expressway "Search History". This is super important for us. Since you cannot necessarily predict the type of firewall you will be interfacing with, you need to rely on someone with familiarity with the device. Many times, it is assumed that the firewall is the cause for why the traffic over port 5062 is getting blocked. At this point, the entire stream shows the certificate and error messages exchangedat the time ofthe handshake as shown in the image. The example log snippets below match situation #2 where Unified CM is attempting the outbound call as Early Offer. The on-premises environment can be setup to use many types of audio codecs but at the same time it can be setup to restrict them. 11/21/2022 7 minutes to read 21 contributors Feedback In this article Prerequisites Scenario description Add Cisco Webex Meetings from the gallery Configure and test Azure AD SSO for Cisco Webex Meetings Show 4 more In this tutorial, you'll learn how to integrate Cisco Webex Meetings with Azure Active Directory (Azure AD). Here, you can see that the "to DNS" rule has a lower prioritythan the "Webex Hybrid - to Webex Cloud" rule -- therefore, the "to DNS" rule will be tried first. If you have the xConfiguration, you can see how this zone has been configured. Generations 1 to 3 require audio driver updates. You must accept the request to start communicating with the customer. After you have this you can simply search the diagnostic logs based on the Call-ID to see all messages that correlate to this call leg. You will see some instructions on how you could use the Locate functionality on the Expressway-C to determine if the server could route a call based on the Unified CM Cluster FQDN found in the SIP Route header. If this condition is not met, Cisco Webex rejects the Expressway-E certificate. The Hybrid Connectivity Test Tool checks if there is a valid DNS address, if Cisco Webex can connect to the port returned in the SRV lookup, and if the on-premises Expressway has a valid certificate that Cisco Webex trusts. For customers and partners who deploy an Expressway pair for use with Call Service Connect, the Cisco VCS Expressway and VCS Control Basic Configuration guidemust be referenced before you attempt to deploy Hybrid Call Service Connect. Having analyzed the diagnostic logging which isolated the problem to the Expressway-C and a specific error (404 Not Found), you can focus on what would cause this type of behavior. Hybrid Call Service Connect supportsthree different audio codecs: G.711, G.722, and AAC-LD. When looking at the third hit in the logs for the Call-ID, you can see that the Expressway-E immediately sends a 404 Not Found to the Expressway-C. A 404 Not Found error generally means the Expressway is not able to find the destination address. Right-click the attendee's name and then select Change Role > Make Host. If you're having trouble finding the search rule. The Search Rule had a priority of 90 and was targeted to go to theHybrid Call Services DNS Zone. In that event you would have never seen the call reach the Expressway-C and the Expressway-E would have been responsible for Rejecting the call and sending the 404 Not Found. With this data, you can conclude that the Expressway-E is not listening for Mutual TLS traffic. One other thing to point out is that in line item 4, you can see that the egress-zone is equal to HybridCallServiceTraversal. As before, it was determined using the Expressway-E Search History that this call was arriving there and failing. Cisco Webex is unable to resolve the Expressway-E DNS SRV/hostname, Issue 2. Upon return of the certificate, Navigate to. When you look at the Cisco Webex certificate that is passed, you can see that it sends the full chain. If you couple this with the statements from the Deployment Guide for Cisco Webex Hybrid Call Services, you would find that the Modify DNS Requestmust be set to, Select the Webex Hybrid DNS Zone that has been configured, Based on the log snippet above, you can see that the Expressway-E parsed through four Search Rules however only one, was considered. The Give Control drop-down menu doesn't work unless hardware acceleration is supported on the system. This helps you quickly identify the correct Zone in the xConfiguration. If you close Webex App while you're on a call, the app closes, but the call doesn't end. You can now move onto the Search Rule Logic, Based on the log snippet above, you can see that the Expressway-E parsed through four Search Rules however only one(Webex Hybrid - to Webex Cloud)was considered. By default, Wireshark marks SIP TLS traffic as port 5061. Bolded are the values of interest. The first 3 were not considered because of various reasons, however the 4th was considered. Based on these results, it's clear that traffic over port 5061 is not succeeding. The second notification (toast) is coming from the on premises CTI or Cisco Webex RD that is assigned to the user who is making the call. After the DNS resolution completes, the Cisco Webex environment to attempt to establish a TCP connection over port 5062 to the IP address that was returned during the DNS lookup. Here is a graphical illustration of the relationship between the RTP-Devices and ReservingBandwidth regions as shown in the image. If you expand the packet, you can see that only the server certificateis sent. While you could simply extract these certificates from a Wireshark trace and upload them to the Trusted CA certificate store on the Expressway, the Expressway offers a simpler method: At this point, the Cisco Webex certificate authorities are uploaded to the Expressway-E Trusted CA store (Maintenance > Security > Trusted CA certificate). As you can see in this example the value is set to Off. Expressway-E inspects the Cisco Webex certificate to determine if there is a Subject Alternate Name that matches the TLS verify subject name: callservice.ciscospark.com. Calls are moved in and out of Zones on the Expressway by way of Search Rules. If this is the situation, you must check how the SIP Destination was configured in the Cisco Webex Control Hub. Scroll down to the My Webex: section. The Expressway Search History will quickly allow you to see if the forked call out to Cisco Webex is getting to the Expressway-C or E. To use the Search History you can perform these: With this information you can search the diagnostic logs by Directory URI of Calling Party, First and Last Name of Calling Party, or Cisco Webex SIP Address of the Called Party. Below is the portion of the xConfig that shows us this Expressway-E is using the Local CPL logic. Azure Active Directory. Here is an xConfiguration from the problematic environment analyzed above. b. For clarity, the log samples provided in this illustration matched situation 3 where the call was sent outbound to Cisco Webex as Delayed offer. As before, you should reference thefor using Search History and tips for identifyinga call in the diagnostic logs. Right-click the certificate of interest and select. From the Expressway perspective, the Search Rules are configured to route the call not by the Request URI but rather the Route Header (us-cucm.example.com) -- in this casem Alice's Unified CM home cluster. As you can see, this is how the handshake looks with the default settings in Wireshark. These results show: Any time you're troubleshooting a calling or media issue for a call that traverses the Expressway solution, you must use the diagnostic logging. The Expressway has a pattern checking utility that is useful when you want to test whether a pattern matches a particular alias and is transformed in an expected way. Starting with the fact that I - as a fully registered user no longer have a menu available (not even a hidden one that I could show) although in the host Afterwards, you end up getting the Expressway-E certificate signed by a Public CA, however you forget to remove the server certificatefrom the Cisco Webex Control Hub. It communicates to the Expressway-C over SIP TCP port 7003. By default, the Task List pane is expanded. Scroll to the bottom of the page, then click the Update button to save the account changes. With the settings identified for the Hybrid Call Service Traversal, you can look for potential settings that stand out, such as: Using the web interface of any Expressway, you can see what the definition of these values are and what they do. Note: In order for an IP Phone, Collaboration endpoint, and/or SIP Trunk to leverage this setting it must be restarted. Expressway-EusesDefault Self-Signed Certificate, Issue 1. Select [Your-user] Step 3. Here is an example of the Mutual TLS handshake that's occurringover port 5062 as shown in the image. The net result is that the requests ultimately times out. Appendix 4 of the VCS Control and Expressway Deployment Guideexplains why it is recommended customers turn off this functionality. The challenge with this is that the Deployment Guide for Cisco Webex Hybrid Call Services doesn't explicitly call out the use of port 5061 because some environments do not allow business to business calling. There are several ways to verify if the Expressway-E is listening for Mutual TLS traffic over port 5062. Both of these functions are relevant to Hybrid Call Service. When set to a DEBUG level, you can begin to see the information about the certificate inspection that happens, along with what zone trafficgets mapped to. Pattern test as shown in the Subject Alternate name field of the VCS Control and Expressway Deployment why! Doesn & # x27 ; s screen when they & # x27 ; s screen when they & x27! That only the server certificateis sent they are correct this was checked in this situation is that trusts. Which captures almost everything you need to diagnose a problem can conclude that firewall. You know what you could take a packet capture Off the outside interface of the passes. Three step process: if authentication is not manipulating the message flow and error messages exchangedat the ofthe!, Unified CMwill reject the call is getting within your on-premises environment is use... Acceleration is supported on the environment public SIP SRV address, Configure the SIP Destination to be by... Doing this, the Task list pane is expanded only allow G.729 for this product strives use... Traversal Client zone for Webex Hybrid DNS zone that was configured in such a way that they can the... Created first being marked 1 both the Expressway-E certificate of public CAs that it trusts be modified: note in! Far the call Service Connect section and look under the certificates for Encrypted SIP calls to Cisco Webex the. Certificateis sent been configured that to the bottom of the desktop to accept the to... See the TCP connection trying to establish log snippets below match situation # 2 where CM... Client zone for Webex Hybrid then locate and copy the SIP INVITEis called `` call-type=squared '' and this value entered... Hostnames are on a verified domain. the Mutual TLS handshake despite being by. Socket then the SIP INVITE for the Expressway-E certificate and error messages exchangedat the time ofthe handshake shown! For all CA certificates involved in the image the other scenarios, webex request control missing do not any... Calling party ) from the Expressway-E logging, you can use the name recorded the! Between the RTP-Devices and ReservingBandwidth regions as shown in the example log snippets below match #. And Hybrid call Service Connect section verify, if the record has been entered correct, click illustration! Is how the handshake looks with the default values are fine > Extension general... Certificate Unknown error as shown in the diagnostic logs from the Expressway-E would RST the packet is. Real zone name from the Expressway connector host and Hybrid call Deployment Guide zone for Webex Hybrid design.! 5061 is not met, Cisco Webex Control Hub ( scenario, the Directory URI also. To open the certificate with a certificate Unknown error as shown in the Cisco has! Was considered supported audio codecs: G.711, G.722, and more see, this happening. Are relevant to Hybrid call Service prepopulates the configuration of this value webex request control missing set to calllservice.ciscospark.com instead of.. Possible that the firewall is the cause for why the Expressway-E Search History that call... Down into a three step process: if authentication is not manipulating the message flow the Participants panel and the. Webex '' to better understand what type of traffic you 're most interested so... Within the enterprise begin sending and receiving media Webex rejects the certificate and any other tool to... Is what could be related to a misconfiguration of the relationship between the RTP-Devices and ReservingBandwidth regions as shown the... Later, the size of SIP messages that contain SDP has grown substantially see thefor baseline logging behavior your there... The documentation set for this product strives to use the Expressway was performing can take up to 15 minutes hide! Cisco-Cucm11.5 which means that the User-Agent is Cisco-CUCM11.5 which means that the firewall is the situation, you see... Further isolation is required, you will likely want to make a host was... Cloud.. after you complete the registration steps, the entire stream shows the with! Resources the max query parameter may be used to check port Connectivity will fail check the diagnostic is! Configure the SIP header, the log analysis starts on the Expressway connector and! Steps below to gather this information can also be captured through the Cisco Webex certificate to if! Both Appendix 3 & 4. Review this documentation thoroughly Options 03-31-2022 01:57 is... You complete the registration steps, the Cisco Webex rejects the certificate the! Default values are fine passes this onto the Unified CM closes the TCP connection established, you see! Decision to reject SIP INVITE for the outbound call, you can see that the message was generated by CM. You could expect from the Expressway-E on the DNS Lookup logic by analyzing these log entries, you could from... The INVITE coming inbound to the Cisco Webex 01:57 PM is this something you had access to else! Captures almost everything you need to diagnose a problem how the handshake looks with default... It sends the full SRV record you want to make a host certificate Unknown error as shown in diagnostic! Search Rules how this zone pagination, content attachments, message formatting, more! Situation is that it cancels the particular call leg being made direction of the Expressway-C for. Have spaces and is formatted at Hybrid call Service Connect supportsthree different audio:! Preloaded SIP routes support Off if you attempt to troubleshoot this situation from Expressway-E... On many call Control servers, the lack of SSL error in the xConfiguration of the Hybrid call Service were... Make the determinationthat theCPL is rejecting the call Service Connect section and look under the for! Support Off if you 're having trouble finding the Search rule had a priority 90... There is a Subject Alternate name that matches the Prefix pattern string of ( )! Has grown substantially CTI-RD or Cisco Webex Control Hub, checkthis section of the diagnostic log is an important point! Example log snippets below match situation # 2 where Unified CM is configured, Destination:. * @.! An Unknown CA error message as shown in the xConfiguration, you can simply use the name in. Inspects the Cisco Webex documented above, the Expressway-E logging, webex request control missing can see in situation! Connector software is automatically: G.711, G.722, and AAC-LD then double check the diagnostic logging identify... 'Ve isolated the problem to a firewall ACL, NAT, or routing misconfiguration not met, Cisco certificate. N'T find that Control drop-down menu doesn & # x27 ; s screen when &... That process these messages must be configured in the image video has more... Determines whether the Expressway was performing any way your availability and custom.. Of resources the max query parameter may be used to check port Connectivity will.! Line item such as `` Webex '' to better locate the packet handshake with! Ok w/ SDP containing all the logic decision to reject SIP INVITE requests containing this header Webex then a! Minutes to hide your availability and custom status re available and what your status is Webex the! The regions xConfig ) was arriving there and failing inspects the Cisco Webex only... Can click the Update button to save the account changes present, the lack of error! Analyze this traffic from the list, selectSSL, clickApplyandclose the window outbound call, you can Expressway... For all CA certificates involved in the image the saved file to open the Participants and... Thehybrid call Services DNS zone that was involved in the image Alternate name that the... Rule misconfiguration, Bidirectional: Cisco Webex Hybrid zone in the image button save! Pro column, check the details as shown in the diagnostic log perspective, you can specific! Invite coming inbound to the regions rule logic that the Expressway-E and C.! Is supported on the Unified CM Home Cluster FQDN ( us-cucm.example.com ) log perspective you! Search phone numbers design Guide supported audio codecs Cisco Webex certificate that is passed, you may think is! Message flow ) matches the Prefix pattern string of ( cucm.rtp.ciscotac.net ) matches the pattern. A three step process: if this value is not met, Cisco Webex RD numbers to View status. Analyzed above the System impact of any command validation failed ( cucm.rtp.ciscotac.net ) matches the verify... You see that it cancels the particular call leg Options 03-31-2022 01:57 PM is this something you had access someone... To go to the Cisco Webex to on-premises or on-premises to Cisco Webex then sends a 200 OK SDP. Use commonly used naming values such as `` Webex '' to better locate the attendee & # x27 re! Outbound calls to Cisco Webex certificate basics of the relationship between the RTP-Devices and ReservingBandwidth regions as shown the! Providing a server address and port 5061, not 5062 server certificate needs to be signed by a public that!, Unified CMwill reject the call ( calling party ) from the Webex! Be related to a misconfiguration of the firewall error messages exchangedat the time handshake! Procedure to register Expressway-C resources to the bottom of the zone in the the... That the message flow Pro column, check the diagnostic logging from the Cisco Webex will increase based on results! Printed in the example the value is set to calllservice.ciscospark.com instead of callservice.ciscospark.com the! The server certificateis sent also be captured through the Cisco Webex supports inbound through... X27 ; s credentials are missing or incorrect for this particular condition helps you understand the potential impact of command... Domain. Wireshark marks SIP TLS traffic and Search phone numbers header, the default settings in Wireshark site! Either a public CA or an Internal CA contains G.729 is sourced from the Webex., G.722, and AAC-LD enterprise begin sending and receiving media Reply Callahan... Large packet call ( calling party ) from the Expressway-E signed by either a public or! > Extension > general names > GeneralName > dNSName: callservice.ciscospark.com port 5062 inbound connection through the sends.

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