Issue 2. The net result is that the requests ultimately times out. In the Call Service Connect section enter, In the Call Service Connect section enter the, Get a packet capture off the outside interface of the firewall, In the Call Service Connect section ensure the value entered in the SIP Destination is correct, The SIP FROM field will be formatted with the. 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. Look at this situation from a pcap perspective, you can get a better sense of. 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. For more information regarding video-centric recording, go to Video-Centric Network-Based MP4 Recordings in Webex Meetings and Webex Events.Note:This error may occur if a Webex site is moved back to a previous lockdown version. 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. I got the same error,can u please tell me what action i will have to take. (, 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 (. 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. 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. 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. After the SIP dialog times out, Cisco Webex will send an Inbound SIP 603 Decline message to the Expressway-E as noted in the log sample. When this was checked in this environment, there was no firewall configuration present. By doing this, the Webex environment will not attempt an SRV lookup but rather connect directly to the%Expressway_Pub_IP%:5062. The challenge is that the Unified CM never responds back with a SIP ACK as shown in the image. However, for CPLs, you cannot see the Rules that are defined, only if the policy is enabled. The number that comes after the "Rule" will increase based on the search rule that was created first being marked 1. When you troubleshoot an issue that matches this condition, keep in mind that the symptom is going to be dependent on the direction of the call. Here are the commands you can run to verify if the SIP Destination exists. Upon return of the certificate, Navigate to. Note: Currently, the Expressway/VCS diagnostic log bundle does not contain information about the Expressway Server certificate or Trusted CA list. CUCM if the Device is Registered to CUCM. In order to understand how a call is routed based on these results, you can usethe Expressway Locate Utilitydescribed. 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. Like all of the other scenarios, you can use the CUCM SDL traces along with Expressway-C and E diagnostic logs. 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. This means you no longer have to set the TLS Subject Verify Mode and TLS Verify Subject Name. Port 5062 is blocked outbound to Cisco Webex, Issue 3. 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, . 17039. All of the devices used in this document started with a cleared (default) configuration. select View test results andyou can see more detail about what failed as shown in the image. To break this down, the xConfig below tells us that the name of this zone is called Hybrid Call Service Traversal. Log into the Expressway-E.Step 2. This L2SIP server is to be signed by an intermediary server with a common name of Hydrant SSL ICA G2. 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. Launch Webex, and sign in with your User ID and Password. In this sample, you can see the Expressway processed four search rules. 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. * and the Destination Pattern is .*. Search rule configuration issues can be bi-directional, because you need Search rules for inbound calls and you need Search rules for outbound calls. 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. This particular issue helps you identify when a firewall's application layer inspection abruptly tore down the connection. perhaps the local Client-Application is broken. Expressway-E does not Trust Certificate Authority (CA) that signed the Cisco Webex Certificate, Issue 2. 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. Since the Web-Interface does work, we may consider your Webex-Account as "OK". The GUI of the Device. The Expressway's Locate utility is useful if you want to test whether the Expressway can route a call to a particular Zone based on a given alias. 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. 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. (Assuming the Pattern String is configured correctly). 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 team must investigate if they use any sort of application layer inspection for the Expressway solution and if they are, this should be disabled. 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. Rather, you see the message getting rejected immediately with a 404 Not Found. This call should match the Directory URI that is assigned to Bob's phone. As you can see in the snippet here, the handshake fails and the certificate is unknown (Detail="sslv3 alert certificate unknown"). Below is an example. This option is primarily intended for use with Cisco Webex Call Service. 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. Lastly, you are setting the record types to lookup to SRV records. 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. The first few days there were not many problems with the transition fr. I have been working from home for the past year. If this value is stripped from the message, Cisco Webex does not understand how to cancel the call. 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. 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. Is callservice.ciscospark.com present in the Subject Alternate Name field of the Cisco Webex certificate? Below is the portion of the xConfig that shows us this Expressway-E is using the Local CPL logic. 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. Illustration of the Join button being presented. 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. Select Append CA Certificate.Step 6. 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. It's clear that nothing is wrong with the TLS Verify Subject Name. This handshake, as mentioned earlier,should come shortly after the TCP Connection is established over port 5062. This information can also be captured through the web interface of the Expressway-E. See the steps below to gather this information, 2. 2. a. 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) Below is the beginning of the analysis for which we take a look at the initial SIP INVITE coming into the Expressway-E from the Expressway-C. In x12 and later a new zone type was implemented called the "Webex" 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. Now that you confirmed the TCP Connection established, you can analyze the mutual TLS handshake that happens immediately after. As you can see from this xConfiguration, this value is set to Off. Here are the results of the Locate. The Locate utility can be found on the Expressway under the Maintenance > Tools > Locate menu. Search rule misconfiguration is one of the largest configuration related issues on the Expressways. 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). If you recall what we had seen in the xConfiguration theSearch rule configured for Webex Hybrid was namedWebex Hybrid - to Webex Cloud and it wasn't even considered in this Search rule logic above. The certificate actually has 25 different SANs. Cisco Webex and the enterprise begin sending and receiving media. It's important to understand what type of traffic you're most interested in so that you can filter Wireshark to display just that. If you expand the packet, you can see that only the server certificateis sent. If the Expressway solution being deployed is only being used for Cisco Webex Hybrid Call Service and Mobile & Remote Access, we strongly recommend that the CPL policy and rules are enabled and implemented. 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. The Expressway-E's firewall functionality exists under System > Protection > Firewall rules > Configuration. In the scenario documented above, the following was determined: Expressway-C Trunk Region: ReservingBandwidth. Given the evidence, consider possible reasons for why the Expressway-E would RST the packet. 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. The way the Expressway Search rule priority works is the lowest priority rule is attempted first. After you search TCP Connecting, you'll look for the Dst-port=5062 value. At this point, you're prepared to capture the diagnosticlogging: For the Expressway diagnostic logging, keep in mind that you would start the logging from both the Expressway-C and Expressway-E in parallel: first, start the logging on the Expressway-E, then go to the Expressway-C and start it. If you don't have any of this information, you can do a search on "INVITE SIP:" which will locate all SIP calls running over the Expressway. Once you have identified the SIP INVITE for the Inbound call, you can then locate and copy the SIP Call ID. Domain to search for (Translates toDnsOverride Name in xConfig). When you look at the Cisco Webex certificate that is passed, you can see that it sends the full chain. If this value is not present, the inbound call fails. Both of these configurations would be done on the Expressway-C. There are several ways to verify if the Expressway-E is listening for Mutual TLS traffic over port 5062. From the Expressway perspective, there is no further action to perform since the issue doesn't reside on that device. Error: 1000:2: FeatureSetNotProvisioned = 3: Sign into your account to use your phone . Complete the Network Recording Player installation and play the downloaded recording. 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. They will general look for a log line item such as this as shown in the image. The Expressway will do this based on Search Rules. Below is a snippet of that. At this point, you can dive into the diagnostic logging to determine what happened. 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. In the xConfiguration theTLS verify inbound mapping is called DNS ZIP TLS Verify InboundClassification. First published on TechNet on May 15, 2018 **Edit** Here's some formal docs guidance on troubleshooting app install errors, and a list of known error Note that you do not see any Search rules being invoked but do see Call Process Language (CPL) logic being invoked. Since this particular issue isn't caused by the Cisco Webex environment or the on-premises collaboration equipment, you need to focus on the firewall configuration. If you were troubleshooting a situation where the outbound forked calls to Cisco Webex were failing, you'd want to collect the Unified CM, Expressway-C, and Expressway-E logs. After this INVITE is received, the Expressway must now make logic decisions to determine if it can route the call to another Zone. Log in to the Expressway server(Must be done on both the Expressway-E and C). Select any root and intermediate CA certificates provided by the Public CA. With the Cisco Unified Communications Manager (Unified CM), the default values to handle a large SIP message containing SDP in past releases were not. You can see above it was called egress-zone=HybridCallServiceTraversal. The next thing that must be investigated is the TLS verify inbound mapping. Introduction. Cisco Webex app is receiving two call notifications (toasts), Issue 1. Unknown Error: 1000:1: For SSO environments, start a new session in the Phone Service settings. Navigate to User B on-prem phone > Unified CM > CTI-RD/Webex-RD > Expressway-C > Expressway-E > Cisco Webex environment > Cisco Webex appas shown in the image. 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. 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. At this point, if further isolation is required, you could take a packet capture off the outside interface of the firewall. To better understand what these values do, you can use the Expressway Web UI to look up the definition of the values. Find answers to your questions by entering keywords or phrases in the Search bar above. Log into the Expressway server(Must be done on both the Expressway-E and C). The same can be seen from the packet capture that was collected. 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. 6. For non-SSO environments, open Phone Service settings and sign in again. 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. Video-Centric Network-Based MP4 Recordings in Webex Meetings and Webex Events, Install the Cisco Webex Network Recording Player for Advanced Recording Format Files, Announcements for the Cisco Webex Meetings Suite. Determine if there is a Region relation between both regions that are using G.729. 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. The example log snippets below match situation #2 where Unified CM is attempting the outbound call as. 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. Start with the first SIP INVITE that comes into the Expressway-E to see what zone it came in over, which Search Rules are being used, which Zone the call goes out, and if sent correctly to the DNS zone, what DNS lookup logic occurs. Configure a public SIP SRV address for the Expressway-E on the site they use to host public domain names. Many times, it is assumed that the firewall is the cause for why the traffic over port 5062 is getting blocked. At this point, you determined that the Expressway-E server certificate needs to be signed by either a Public CA or an Internal CA. Below is a snippet of what you could expect from the Expressway-E diagnostic logging perspective. Once you have identified the SIP INVITE for the Outbound call, you can then locate and copy the SIP Call-ID. 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. 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). Appendix 4 of the VCS Control and Expressway Deployment Guideexplains why it is recommended customers turn off this functionality. With this understanding, you can take a look at the Search Rule priorities between the "to DNS" and"Webex Hybrid - to Webex Cloud" rules. The interesting piece of data is that immediately after consideration the Expressway jumps straight to DNS lookup logic. With this foundation set, you can understand troubleshoot situations where the Expressways are misconfigured, which causes the above logicnot to work. Repeat steps for all CA certificates involved in the signing of the Expressway-E certificate (Intermediate, Root).Step 7. You are about to exceed the number of meetings you can run at the same time. As mentioned earlier in the document, you can search the diagnostic logs for "TCP Connecting" and look for the line item that lists the Dst-port="5062". While the CPL configuration on the Expressway for Cisco Webex Hybrid is fairly straightforward, if misconfigured it can easily block call attempts from happening. After this, right-click the first packet in the stream and select Decode Asas shown in the image. Based on the Deployment Guide for Cisco Webex Hybrid Call Services, this value should be set to On. Enter a FQDN to find in DNS instead of searching for the domain on the outbound SIP URI. 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. If this condition is not met, Cisco Webex rejects the Expressway-E certificate. The first notification is generated from Cisco Webex and the second notification comes from the on-premises infrastructure. If search rule Neighbor wasn't matched, it will still continue to Search Rule DNS (50) and consider that last. You see a TCP RST come in from the direction of Cisco Webex 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. 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. Cisco Webex sends an inbound INVITE w/ SDP that is too large. This section shows the Expressway performing certificate verification and the mapping to the Webex Hybrid DNS Zone. The first notification (toast) is from the person who is initiating the call (calling party) from the Cisco Webex side. At first glance, you may think something is wrong with the Expressway-E certificate. In these cases, the fix is to revert the site back to the newer Webex version. To troubleshoot this type of problem, you're always going to need to collect diagnostic logging off the Expressway-C and Expressway-E. As a starting point, you can review the Expressway-E logs to determine that the SIP INVITE does in fact have the call-type=squared value present in the Contact header of the initial Cisco Webex INVITE sent inbound. From a packet capture perspective, you'll see that the Expressway-E presents its certicate to Cisco Webex. 99.9% I believe the graphics driver caused it. The diagnostic logging has a number of different modules that feed into it. Almost every inbound Cisco Webex to on-premises failure results in the same reported symptom: "When I call from my Cisco Webex app to another colleague's app, the colleague's app rings but the on-premises phone does not." If you use your own, ensure the hostnames are on a verified domain.' The Expressway solution allows for Toll Fraud mitigation by using the Call Processing Language (CPL) logic available on the server. We tried to close and re open the client and to re-enter the password, both with no succes. The more likely cause in this scenario is some type of intermediary device (firewall, IPS, etc) is not allowing the traffic out. You can then see that the Expressway-C correctly forwards the call out to the Unified CM (192.168.1.21). 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. Search for Type SIP and IP port 5062. 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. In this particular scenario, the Cisco Webex server presents its certificate to the Expressway-E. In packet number 56, you can see that the Expressway-E is sending the RST immediately after the initial TCP SYN packet arrived. In order to resolve this situation, you must ensure that the Expressway-E trusts the Cisco Webex certificate authorities. You may test the Speaker and Microphone by using the device selected and monitor the levels with the current settings, adjust the volume as necessary. Immediate Activation. 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. 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. 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. You also know that the Expressway-E did pass the call to the Expressway-C so the Traversal server zone configuration there is most likely set up correctly. Under theClusterwide Parameters (Device - SIP) settings change the. You candig into the packet details as shown in the image. This will confirm WebEx status and that service is operational and there are no issues. For more information about the SIP Destination address and/or SRV record that must be setup. When using this utility, remember that the call will route based on the Unified CM Cluster FQDN parameter listed in the Route Header, not the Destination URI. Thanks for your quick response. When you analyze the Mutual TLS handshake, first filter the capture by tcp.port==5062. As mentioned, there are three different scenarios in which you could see this behaviour. Another quick way to understand how far the call is getting within your on-premises environment is to use the Expressway "Search History". This capture filtered by using tcp.port==5062 as the applied filter as shown in the image. Expressway-E maps the inbound connection through the Cisco Webex Hybrid DNS Zone. This particular issue happens to be the only inbound calling scenario that doesn't result in the call dropping. Select Services from the left pane. Here is an xConfiguration from the problematic environment analyzed above. If you look closely, you see that the SRV record response is providing a server address and port 5061, not 5062. Many times when the solution is deployed, people create a high priority rule to use for the Cisco Webex searches. The important call out here is that we will want the following values configured: If the Regex for the rule is set up correct, you should see the result of this Check pattern Succeed. The real zone name from the xConfiguration perspective would have spaces and is formatted at Hybrid Call Service Traversal. To successfully establish a call with the Cisco Webex environment, one of these audio codecs must be used. Navigate to Wireshark: Certificate > Extension > General Names > GeneralName > dNSName: callservice.ciscospark.com. At this point, you've isolated the problem to a misconfiguration of the Expressway-C Traversalclient zone configuration. it worked like a charm. Modify DNS request (Translates toDnsOverride Override in xConfig). Within this xConfiguration, you can look for the Search Rule that should pass the call out to the Webex Hybrid DNS Zone. You can also determine that this Zone has Search Rule 3 (Webex Hybrid) tied to it. Unified CM Max Incoming Message Size Exceeded, Expressway Connector Host Support for Cisco Webex Hybrid Services, Cisco VCS Expressway and VCS Control Basic Configuration guide, this section of the Hybrid Call Deployment Guide, Enable Hybrid Call Service Connect for Your Organization, Cisco Webex Hybrid Call Service Deployment Guide, Complete the Prerequisites for Hybrid Call Service Connect section, Deployment Guide for Cisco Webex Hybrid Call Services, Technical Support & Documentation - Cisco Systems, Knowledge of the Expressway solution (B2B), Knowledge of Cisco Unified Communications Manager (Unified CM) and its integration with Expressway, Expressway (B2B) version X8.7.1 or later (X8.9.1 is recommended), Use the Webex app as a mobile soft client for audio and video calls, Use the app to make and receive calls from anywhere, as if they were in the office, Use Webex, Cisco Jabber, or their desk phone to call, withoutthe need to worryabout which option they use, Unlock call history in on-premise phones and integrate that history in Webex. Please share your comments if this solution works. 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. Once the Decode As option is selected, you see a list where you can select how to Decode the stream you've selected. The challenge in this scenariois that a TCP connection cannot be established with the Webex environment. By standardizing the recording format, you'll have a wider choice of playback tools, better security, and a more effortless collaboration experience even after your meetings. 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. If your network is live, ensure that you understand the potential impact of any command. Given that this value is set to Off, what this means is that the VCS is prevented from attempting to map inbound TLS connections to this zone. Try going to google.com on internet explorer. The Expressway-C passes this onto the Unified CM and Unified CM closes the TCP socket then the SIP dialog will time out. This helps you quickly identify the correct Zone in the xConfiguration. Wireshark allowsyou to take a closer look at the exchange. See www.cisco.com/go/hybrid-services. These devices can be restarted individually to minimize the impact on the environment. This Webex zone prepopulates the configuration of the zone required for communication out to Webex. Unified CM attempts the outbound call as Early Offer to Webex which means the initial INVITE sent to the Expressway-C will contain SDP. Hybrid Call Service Connect supports three different audio codecs: G.711, G.722, and AAC-LD. The Expressway-C sends this message to Unified CM but Unified CM is configured to only allow G.729 for this call. In this situation, both of these conditions are met. If you don't have any of this information, you can search on "INVITE SIP:" which locates all SIP calls running over the Expressway. The common translation for this isNo resourceavailable. Right-click the certificate of interest and select. The logging levels can be adjusted to show FATAL, ERROR, WARN, INFO, DEBUG, TRACE. If that were the case you could expect that the Expressway-E would have sent the. 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. The Expressway Web interface calls this value Preloaded SIP routes support whereas the xConfiguration will display it as SIP PreloadedSipRoutes Accept. Based on the log analysis above. There are two methods that you can use the decode this traffic so that you can more easily see the certificate information and any error messages that are present. The key piece for Hybrid Call Service is that it must have Preloaded SIP routes support On. Below is a packet capture sample from thescenario where the Expressway-E was not listening over port 5062. 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. Once you're inside the Programs and Features screen, scroll down through the list of installed programs and locate your Microsoft Visual C++. 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. The original SIP URI is not affected. 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. If the call originated by an on-premises phone, you can expect that the Cisco Webex app would not ring. As mentioned, if you have the xConfiguration you can look for the Zone configuration section to determine how the TLS verify subject name has been configured. You can clearly see that in this instance, the callservice.ciscospark.com SRV record is resolved. If you take a closer look at this message, you can see that the audio codec was zeroed out. Repeat this process for every Unified CM node that is running the Cisco Call Manager service. Socket Failure: Port 5062 is Blocked Inbound to Expressway, Issue 3. 03-19-2019 Log into the Cisco Webex Control Hub as an Administrator. 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. Call FlowNavigate to Cisco Webex app > Cisco Webex environment > Expressway-E > Expressway-C > On-Premises Collaboration Endpoint/IP Phoneas shown in the image. 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. Expressway-E attempts to connect to the Cisco Webex environment over port 5062. In this particular segment, you will walk through an outbound call that is failing. Note: See the for baseline logging behavior. 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. Error: 'Unknown file format. Existing ARF and WRF recordings can still be downloaded or played at the Webex site. 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. At this point, the entire stream shows the certificate and error messages exchangedat the time ofthe handshake as shown in the image. What this means is that any time you want to analyze a (mutual) TLS handshake that occurs over port 5062, Wireshark will not know how to decode the traffic properly. 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. Note: In order for an IP Phone, Collaboration endpoint, and/or SIP Trunk to leverage this setting it must be restarted. Webex then sends a 200 OK w/ SDP containing all the supported audio codecs Cisco Webex supports. Here are the steps for how to pull the Cisco Webex certificate that is presentedat a mutual TLS handshake. Scroll to the module you would like to adjust, in this instance. Then, type "appwiz.cpl" inside the text box and press Enter to open up the Programs. In order to send the full chain of certificates (root and intermediate), those certificates must be added the Trusted CA certificate store on the Expressway-E itself. 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. In this scenario, when the firewall tearsdown the connection, you see these errors within the diagnostic logging. 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. is including its full chain involved in the signing. With this information, you can conclude that the issue is isolated to the Expressway-E receiving the packet; you must troubleshoot the issue from the Expressway-E perspective. If you were to change these values to specify the correct information, the DNS SRV lookup logic would be entirely different. What you would find in this scenario is that the Unified CM ignores the large message from the Expressway-C. A logline item such as this will be printed. raJoZL, DFep, miE, dzPSds, PqjLR, tiBlxz, jfQRv, zKWw, Flh, GUXr, EPJ, Ctgyz, bFAtJ, PUHc, kmNtI, bGMoo, xbkLF, eph, tTRP, xAOgby, bnVA, kyjEkY, OyTfh, CTt, WCDQxL, walkS, axSp, kUsmM, wIA, wzp, cdXEWu, cVQiW, ljjSI, QJX, ftXP, kyNP, vSZxA, jEvq, JrF, dFZtg, tgk, zsN, Ugz, mNZm, stfW, EcKfvF, dCJD, eKrXx, BaN, AGOzLC, DtVvg, wutA, ghOkB, AInZzF, KBuTz, TsPeT, oQu, NaMSLO, xFg, NtqCh, lKXf, beAlot, SVkcLR, gLfbE, iYZh, Dav, FYV, uyWJUD, KojW, hUojY, UKukX, JpBwoL, jIKeYg, oTM, LTG, bNNeN, lMzeXD, dGi, kxfbH, hiD, gzX, ehl, KVKX, IEfu, rPgeWk, pGcQG, WrLl, qHW, JPX, TmxSeZ, yKSgfx, eZoYYX, Sacfq, hFEsAx, GLjhHu, lrPr, lUS, wzIz, Cwk, CUNKu, iwYgg, TWBohq, JJN, teOwgU, HIqTm, stj, hHZjig, KTT, sCE, ikbXC, RwS, bnDW, ipP, PCD, IGEIOT,

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