Step 1. Navigate to Maintenance > Security > Trusted CA certificate.Step 3. Repeat this process for every Unified CM node that is running the Cisco Call Manager service. In these cases, the fix is to revert the site back to the newer Webex version.Cause:The following error occurs when playing a recording created on a newer site version than the installed Network Recording Player. However, Hybrid Call Service Connect intended to use TCP port 5062, not 5061. Locate the packet that is sourced from the Webex server address and has Certificate printed in the Info section. To schedule a meeting now, please use a computer. For more information about uploading your Expressway-E certificate in the Cisco Webex Control Hub, checkthis section of the Hybrid Call Deployment Guide. Free Demo. After this, right-click the first packet in the stream and select Decode Asas shown in the image. ssl.handshake.certificate && tcp.port==5062. As expected, both the Search Rule and Traversal Server zone on the Expressway-E are configured correctly. Calls are moved in and out of Zones on the Expressway by way of Search Rules. You can see above it was called egress-zone=HybridCallServiceTraversal. This option is primarily intended for use with Cisco Webex Call Service. You candig into the packet details as shown in the image. The symptom for this particular condition is the same as almost every other Cisco Webex inbound call failure: the on-premises phone does not ring. 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. Many times this rule that is created isn't getting invoked because of existing lower priority rules are being matched and it results in a failure. For Cisco Webex to properly cancel the call leg, Cisco Webex initially needed to put a parameter in the SIP header which it would look for to cancel that given leg. It's possible that the issue could be related to a firewall ACL, NAT, or routing misconfiguration. If that were the case you could expect that the Expressway-E would have sent the. Find answers to your questions by entering keywords or phrases in the Search bar above. Recordings that have been created while the site was on a newer release will not be able to be played back (streaming) using the player on the lockdown version. for using Search History and tips for identifyinga call in the diagnostic logs. Like all of our other outbound forked call scenarios, the symptoms remain the same: Like all of the other scenarios, you will also want to leverage CUCM SDL traces along with Expressway-C and E diagnostic logs. Error: 1000:2: FeatureSetNotProvisioned = 3: Sign into your account to use your phone . 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. 5. Note: If there is only one DNS Zone being used on the Expressway, a separate DNS Zone should be configured to be used with Hybrid Call Service that can take advantage of these values. MP4 Recordings Default in Webex Meetings 40.10In the upcoming October (40.10) update, all-new recordings in Webex Meetings will be stored in MP4 format, either in the cloud or locally as selected at the site or host level, with a video-centric experience. If your network is live, ensure that you understand the potential impact of any command. Once you have identified the SIP INVITE for the Outbound call, you can then locate and copy the SIP Call-ID. Introduction. Search for Type SIP and IP port 5062. 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. If you inspect the Default Server certificate from the Expressway-E, you can see that the 'Common Name' and 'Subject Alternate Names' do not contain the 'Verified Domain'(rtp.ciscotac.net). As pictured below, you can clearly see that the public domain does not have a corresponding SIP SRV record associated to it as shown in the image. Unknown Error: 1000:1: For SSO environments, start a new session in the Phone Service settings. You may face this issue if your IE is working in offline mode. Here is a sample of the TCP Connection being attempted, then establishing. Knowing this, review the Cisco Webex Hybrid Call Service Deployment Guide and specifically review the Prepare Your Environment chapter where step 5 of the Complete the Prerequisites for Hybrid Call Service Connect sectioncalls out the specific codecs that are supported. With this information at hand,you can conclude that Unified CM is sending an unsupported audio codec which is the reason the Cisco Webex is zeroing out the port. 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. Based off this xConfiguration the DNSOverride Override is set to Off, therefore the DNSOverride Name would not take effect. Log in to the Expressway server(Must be done on both the Expressway-E and C). From the list, selectSSL,clickApplyandclose the window. 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. See www.cisco.com/go/hybrid-services. Below is the beginning of the analysis in which you can take a look at the initial SIP INVITE coming into the Expressway-E from the Expressway-C. To better understand the rule configuration, you need to log in to the Expressway-E and navigate to, Compared to what's been documented in the. CUCM if the Device is Registered to CUCM. I have just done a fresh install of IE9. Two logging modules are available on the Expressway which can help you better understand what logic the Expressway performs when you analyze the certificates: By default, these logging modules are set to an INFO level. From the Expressway perspective, there is no further action to perform since the issue doesn't reside on that device. User B's available Cisco Webex app begins to ring. When searching you can select Device Type contains Webex or CTI Remote Device (depending on what the customer is using). Consider the case where the Expressway-E checks the certificate for the callservice.ciscospark.com SAN but doesn't find that. 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. What happens in this scenario is that you upload the Expressway-E server certificate (which has been signed internally) to the Cisco Webex Control Hub so that you can complete the mutual TLS negotiation successfully. This issue happens on both inbound and outbound calls to Cisco Webex. 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. Generally, troubleshooting is a process of elimination, so the first place to start when experiencing a connection problem is to visit the Cisco service status page. If the Cisco Webex environment is unable to establish this TCP connection, the call inbound to the premises is subsequently fail. In that instance, the Expressway-E and Expressway-C Seach History would not show anything. Since the test has failed you can click the View test results link to check the details as shown in the image. Cisco Webex has a full list of public CAs that it trusts. If you attempt to troubleshoot this situation from an Expressway-E diagnostic log perspective, you do not see any trafficfrom Cisco Webex. Illustration of the Join button being presented. In order to resolve this situation, you must ensure that the Expressway-E trusts the Cisco Webex certificate authorities. Under theClusterwide Parameters (Device - SIP) settings change the. You are about to exceed the number of meetings you can run at the same time. This will ensure that the firewall is not manipulating the message in any way. Unified CM attempts the outbound call as Early Offer to Webex which means the initial INVITE sent to the Expressway-C will contain SDP. Therefore, many people will misdiagnose the condition and assume it is the firewall. Like all of other outbound forked call scenarios, the symptoms remained the same: Like all of the other scenarios, you can use the CUCM SDL traces along with Expressway-C and E diagnostic logs. This value can be turned On or Off in the Zones (Traversal server, Traversal client, Neighbor) on both the Expressway-C and Expressway-E. (note the extra "l"). Upon return of the certificate, Navigate to. 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. Now that you have these definitions, it's clear that these values if set correctly would be entirely relevant for our DNS lookup logic. a. As part of the mutual TLS handshake, Hybrid Call Service Connect uses TLS Verification. 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. At this point, the entire stream shows the certificate and error messages exchangedat the time ofthe handshake as shown in the image. 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. You may update your Network Recording Player and try again. 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. 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. Based on the log analysis above. 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. Existing ARF and WRF recordings can still be downloaded or played at the Webex site. The scenarios below show you how to use the diagnostic logging to identify a CPL misconfiguration. For tips on isolating call issues and analyzing logs, see the section of this article as shown in the image. Switch Preloaded SIP routes support On to enable this zone to process SIP INVITE requests that contain the Route header. When you analyze packet captures, it's easy to get lost in the sheer amount of packets observed in a given capture. In the above Expressway-E diagnostic logging snippet, you can see that the Expressway-E is trying to connect to the IP 146.20.193.64 which was previously resolved over TCP port 5061 however this connection is outright failing. As you can see in this example the value is set to Off. 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 example log snippets below match situation #2 where Unified CM is attempting the outbound call as. To answer the question of what happens, you must know that once the Unified CM receives a SIP message that is too large, it simply closes the TCP socket and does not respond to the Expressway-C. With this said, there are many situations and ways this could occur: Looking through the Expressway-C logs for this particular condition helps you understand the message flow. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. 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). Expressway-E accepts the Cisco Webex certificate. Here is an xConfiguration from the problematic environment analyzed above. 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. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, . If you have the xConfiguration, you can see how this zone has been configured. Note that you do not see any Search rules being invoked but do see Call Process Language (CPL) logic being invoked. I'm trying to sign into my job's queue but WebEx isn't allowing me to sign in, I've reset my computer, uninstall/installed WebEx again and tried different internet connections (ethernet, wifi, hotspot) Cisco Webex is unable to resolve the Expressway-E DNS SRV/hostname, Issue 2. Scroll to the module you would like to adjust, in this instance. Select the Hybrid Call Service Traversal client zone (naming will vary customer to customer), Select the Zone that's being used for the Hybrid Traversal Server, Set the SIP parameter preservation value to, User A makes a call from their on-premses phone to the Directory URI of User B, User B's on-premises phone and CTI-RD/Webex-RD accept the call, User B's on-premises phone begins to rings, User B's CTI-RD/Webex-RD forks this call out to the destination of UserB@example.call.ciscospark.com, Unified CM passes this call to the Expressway-C, Expressway-C sends the call to the Expressway-E, Expressway-E performs a DNS lookup on the callservice.ciscospark.com domain. Try going to google.com on internet explorer. (highlighted in red as shown in the image). This capture filtered by using tcp.port==5062 as the applied filter as shown in the image. In order to make this change: If you analyze the same capture now, you see packets 169 through 175 decoded. 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. 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. Select Choose Fileunder the Upload menu near the bottom of the UI.Step 4. However, for CPLs, you cannot see the Rules that are defined, only if the policy is enabled. Like Outbound call Issue #1, you can start analysis at the Expressway-E diagnostic logging, because you've used the Search History on the Expressway to determine that the call is getting that far. Webex then sends a 200 OK w/ SDP containing all the supported audio codecs Cisco Webex supports. 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. Below is the beginning of the analysis in which you can take a look at the initial SIP INVITE coming into the Expressway-E from the Expressway-C. If you analzye the SIP INVITE that Cisco Webex sends inbound to the Expressway-E, you'd find the following information within the SIP header. 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. 2. is including its full chain involved in the signing. This confirms ifyou are correctly mapping the TLS connection to the Webex Hybrid DNS Zone. If you're trying to identify a Hybrid Call Service Connect call failure that matchesthis issue, you must get the Expressway logs in addition to Unified CM SDL traces. From an Expressway-E diagnostic logging perspective, this issue may look similar to the loggingsignature that is met when Cisco Webex doesn't trust the Expressway-E certificate -- for example, the case of the Expressway-E not sending its full chain or the Expressway-E certificate not being signed by a public CA that Cisco Webex trusts. While the CPL configuration on the Expressway for Cisco Webex Hybrid is fairly straightforward, if misconfigured it can easily block call attempts from happening. 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. You are trying to schedule a meeting through a Webex service that is not yet supported on your mobile device. At the bottom of the interface, you will now see the search results. The Expressway-E's firewall functionality exists under System > Protection > Firewall rules > Configuration. Navigate to Wireshark: Certificate > Extension > General Names > GeneralName > dNSName: callservice.ciscospark.com. In order to address the issue in this scenario, you must uploadthe intermediate and root CAs that are involved in the signing of the Expressway-E certificate to the Trusted CA certificate store: Step 1. You can now conclude that the reason the Cisco Webex app is getting a second notification (toast) when dialed is because of the Expressway-E stripping the call-type=squared tag from the SIP INVITE Contact header. When you look at the Cisco Webex certificate that is passed, you can see that it sends the full chain. 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. You must switch the Preloaded SIP routes support to On. If you're using any code version below x12.5 or are not using the Webex zone you'll want to proceed with the explanation below that demonstrates how to identify and correct issues where the Expressway is not mapping the inbound call to the Webex Hybrid DNS Zone. Remember the things you want to look for are: As you can see in the INVITE above, the INVITE is received as normal. Expressway-E maps the inbound connection through the Cisco Webex Hybrid DNS Zone. Scroll to the Call Service Connect section and look under the Certificates for Encrypted SIP Calls to see if undesired certificatesare listed. So, Unified CM will reject the call due to no available codec. 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. The Expressway connector host queries the Unified CM for users who are enabled for the Call Service and pull both their Directory URI and the Cluster FQDN of their Unified CM home cluster. Below is a snippet of that. This scenario articulates issues and challenges observed with the Expressway prior to x12.5. Set the value back to 5061 when the analysis is completed as shown in the image. With this data, you can conclude that the Expressway-E is not listening for Mutual TLS traffic. For this particular solution, you as a partner or customer must rely on your security team. Note: As of Expressway code x12.5 and later a new "Webex" zone has been released. Once you identify the area in the logs where this connection was attempted and established, you can then look for the TLS Handshake which is generally denoted by the log entries that indicates Handshake in progress. In the xConfiguration the, the domain used for the public SIP SRV address, Configure the SIP Destination to be formatted as. By default, Wireshark marks SIP TLS traffic as port 5061. At that point, you can then reproduce the problem. The common translation for this isNo resourceavailable. If you're having trouble finding the search rule. From the root of the Expressway, if you issue netstat -an | grep ':5062' , you should get some output similar to what you see below. Cisco Webex then rejects this TLS handshake with an Unknown CA error message as shown in the image. 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. In this condition, the particular log entry above will not exist. After you have this value, you can simply search the diagnostic logs based on the Call-ID to see all messages that correlate to this call leg. 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. Because the issue was isolated, this data should be provided to the customer's network administrator. It worked for me; it will work for you. If so, click the trash can icon next to the certificate. After review of this Search rule, you can conclude the following: What this information tells us is that the Cisco Webex Request URI being called would match this rule and if the rule was matched the Expressway would stop searching (Considering) other Search rules. The Expressway-E has some type of firewall rules set up that could be blocking the traffic. Click for details," then you need to reconnect. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. 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. In order to solve this problem, you must ensure that the Mutual TLS mode is enabled and that the Mutual TLS port is set to 5062on the Expressway-E: With Hybrid Call Service Connect, the call routing is done based on route header. To troubleshoot this scenario, it's important to understand both the call flow and logic that are occurring when this type of call is being placed. If the customer does not have a SIP SRV record present (and does not plan to create one), they can alternatively list the Expressway Public IP address suffixed by ":5062". Hybrid Call Service Connect supportsthree different audio codecs: G.711, G.722, and AAC-LD. Most commonly, this is used if you want to test whether your Search Rule regex is going toproperly match an alias to a pattern string and then optionally perform successful manipulation of the string. The problem is that with this design, the Directory URI is also assigned to his CTI-RD or Cisco Webex RD. A few line items later, the Cisco Webex environment rejects the certificate with a Certificate Unknown error as shown in the image. The Inbound TLS mapping feature works in conjunction with the TLS Verify Subject Name, both of which are configured on the Hybrid Call DNS Zone. 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. If this value is not present, the inbound call fails. Select Append CA Certificate.Step 6. 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. 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. Expressway-E attempts to connect to the Cisco Webex environment over port 5062. The servers that process these messages must be configured in such a way that they can accept a large packet. As you can see, this is how the handshake looks with the default settings in Wireshark. This IP address is going to be the public IP address of the on-premises Expressway-E. 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. In packet number 56, you can see that the Expressway-E is sending the RST immediately after the initial TCP SYN packet arrived. Note: The bottom/last certificate in the chain is the root CA. As before, you should reference the for leveraging Search History and tips for identifyinga call in the diagnostic logs. 2. Step 2. (, 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 (. At this point, if further isolation is required, you could take a packet capture off the outside interface of the firewall. This section shows the Expressway performing certificate verification and the mapping to the Webex Hybrid DNS Zone. In order to resolve this issue, the TLS Verify Subject Name must be modified: Note: See thefor baseline logging behavior. This particular issue helps you identify when a firewall's application layer inspection abruptly tore down the connection. The Search Rule had a priority of 90 and was targeted to go to theHybrid Call Services DNS Zone. You will find that the Hybrid Connectivity Test tool and any other tool used to check port connectivity will fail. Here is a snippet of the initial INVITE out to Cisco Webex. Example of the Expressway-E mapping the MTLS connection to the Cisco Webex Hybrid DNS Zone: Here is a list of the most common issues that are related to mutual TLS failures between the Expressway-E and Cisco Webex. Using the Expressway-E Search History, you can determine that the call made it to the server. With the Cisco Unified Communications Manager (Unified CM), the default values to handle a large SIP message containing SDP in past releases were not. From a Wireshark packet capture analysis perspective, you can clearly see that when the Webex environment presents its certificate then Expressway turns around and rejects with a certificate with an Unknown CA error as shown in the image. The real zone name from the xConfiguration perspective would have spaces and is formatted at Hybrid Call Service Traversal. Looking through the Expressway-C logs for this particular condition helps you understand the message flow. 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. Problem: Webex Unable to Place Calls when it is Paired to an On-Premise Registered Device. Example of the Expressway-E that conducts a SAN inspection of Cisco Webex's server certificate. Expresswayis unable to resolve the callservice.ciscospark.com address, Issue 2. Note: It is important that the analysis is conducted and it is determined that the customer is not using the certificates uploaded to the Webex Control Hub prior to removing them. Learn more about how Cisco is using Inclusive Language. When you analyze the Expressway-E diagnostic logs, you'll see an error similar to that here: If you analyze this from a Wireshark perspective, you see that the Expressway-E presents its certificate. Error: 1000:2: FeatureSetNotProvisioned = 3: Sign into your account to use your phone . Here is an example of the Mutual TLS handshake that's occurringover port 5062 as shown in the image. Socket Failure: Expressway-E is not Listening on Port 5062, Issue 4. Immediate Activation. After this INVITE is received, the Expressway must now make logic decisions to determine if it can route the call to another Zone. 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. 99.9% I believe the graphics driver caused it. 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. In response to this initial INVITE, Cisco Webex responds with a 200 OK message. Configure a public SIP SRV address for the Expressway-E on the site they use to host public domain names. Since the Web-Interface does work, we may consider your Webex-Account as "OK". Here are the steps for how to pull the Cisco Webex certificate that is presentedat a mutual TLS handshake. and Features utility. The calling ID in this instance is the Display Name of the user initiating that call. Additionally, this document assumes that the Expressway connector host and Hybrid Call Service activation were completed. At first, this behavior seems peculiar. 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. 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. In the snippet above, you can see that the Expressway-E performed the SRV lookup based on the right hand side on the Request URI (_sips._tcp.dmzlab.call.ciscospark.com) and it has resolved to a hostname ofl2sip-cfa-01.wbx2.com and port 5061. The intermediary is signed by a root certificate authority that has a common name of QuoVadis Root CA 2as shown in the image. Within this xConfiguration, you can look for the Search Rule that should pass the call out to the Webex Hybrid DNS Zone. To successfully establish a call with the Cisco Webex environment, one of these audio codecs must be used. When this name is printed into the Via line of the SIP Header, the spaces are removed. When thinking about the Cisco Webex to on-premises call flow, Cisco Webex's first logical step is how to contact the on-premises Expressway. Based on these results, it's clear that traffic over port 5061 is not succeeding. So, Unified CMwill reject the call due to no available codec. As part of the mutual TLS handshake, Cisco Webex must trust the Expressway-E certificate. This error may occur if a Webex site is moved back to a previous lockdown version. The hostnamel2sip-cfa-01.wbx2.com resolves to 146.20.193.64. - edited Navigate toMaintenance Tools > Port usage > Local inbound ports, 3. With this information, you can revisit the scenario presented earlier where the user's Cisco Webex app was receiving two notifications (toasts) when Cisco Webex user Jonathan Robb was making a call. 2. In the xConfiguration of the Expressway-E, you can see there are two particular values of interest that relate to DNS lookups: DNSOverride Name and DNSOverride Override. * and the Destination Pattern is .*. If a packet capture is included with the diagnostic logging, you can verify that the firewall is not the cause. To resolve this issue, you need to readjust the CPL rule configuration so that the Source is set to .*@%Webex_subdomain%\.call\.ciscospark\.com. As before, it was determined using the Expressway-E Search History that this call was making it there and failing. 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