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Microsoft Teams DR & Avaya SBC – The missing ACK
by George Goglidze, CCIE #19926 Microsoft Teams DR & Avaya SBC - The missing ACK Had a case recently with a customer that had an Avaya SBCE for Direct Routing with Microsoft Teams. They had an issue with outbound calls to PSTN. Interestingly the inbound calls were working just fine. After analysing the SIP Traces...
May 13, 2021
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Microsoft Teams Dial Plan
by George Goglidze, CCIE #19926 Microsoft Teams Dial Plan This is another blog from the how-to series, and the idea came to me as a colleague was asking me a question about the French dial plan. He was interested in how to set it up, and what are all the components required for a functional...
May 10, 2021
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Microsoft Teams vs Cisco Webex Teams
by George Goglidze, CCIE #19926 Microsoft Teams vs Cisco Webex Teams There I was, a young engineer starting to learn some CUCM, and I thought that was the pinnacle of collaboration at the time. I have always loved bringing people together, bridging the gap of communication so to say. Maybe that’s why I was a...
April 18, 2021
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Microsoft Teams Useless SIP Options or the curious case of delayed SBC failover
by George Goglidze, CCIE #19926 Microsoft Teams Useless SIP Options or the curious case of delayed SBC failover I had a support request the other day, asking to see why the failover to the second SBC was taking over 20 seconds. This had me scratching my head for a little bit and digging some more...
April 16, 2021
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March 25, 2021
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Microsoft Teams & CUCM Simultaneous Ringing
by George Goglidze, CCIE #19926 1. Lab information To find out more about the actual integration of CUCM with Microsoft Teams, we explain this in detail on the following link: https://ipcorp.co.uk/microsoft-teams-direct-routing-cisco-cucm-integration/ 1.1. User setup On CUCM side, I have an user with number: +442050000001 On Microsoft Teams side, I have enabled user for DR /...
March 25, 2021
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Cisco SBC CSR 1000v cannot handle REFER Message from Microsoft Teams
(To bug or not to bug, that is the question) by George Goglidze, CCIE #19926 1. Lab information To find out more about the actual integration of CUCM with Microsoft Teams, we explain this in detail on the following link: https://ipcorp.co.uk/microsoft-teams-direct-routing-cisco-cucm-integration/ As a note and the important/relevant part of the configuration, the sip refer supplementary...
March 16, 2021
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Webex adding a new IP range to their cloud services

Cisco, has just announced addition of new IP range into their Cisco Webex Cloud services. This is good news, it means they are growing, and are strongly situated in the market….

March 14, 2021
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Microsoft Teams Direct Routing & Cisco CUCM Integration
George Goglidze, CCIE #19926 1. Lab information 1.1. Topology Below, topology has been used for this lab. An office location, with: CUCM Firewall Cisco CSR 1000v SBC A home user with Microsoft Teams. IP Addresses given above are not real. But you get the idea. 1.2. Software Versions and Licenses For lab purposes, a trial...
February 18, 2021
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