![]() ![]() The example above works well for local SIP traffic that should be bound to the loopback address. The section below shows how one might bind SIP traffic to a loopback interface. If I want all SIP traffic bound to an interface I bind it globally under the "voice service voip" portion of the configuration. ![]() GigibitEthernet 0/0/0) while binding it's local SIP traffic to a loopback address? How does CME bind SIP messaging to the telco from a Northbound interface (E.G. Let's say there is a Communications Manager Express and a PSTN SIP trunk to the telco that requires authentication. Internal certificates are allowable however the WebEx Control Hub needs to trust the issuing CA chain.2 firewalls are recommended, however, I have also seen it designed with 1.Cisco Expressway-E Traversal Host (with 2 NICs).On-premises PSTN connectivity via a Cisco Voice Gateway or CUBE. ![]() Cisco Unified Communications Manager solution on-premises.Cisco WebEx Cloud registered video endpoints.In the meantime, here is a high-level list of what's under the hood. What's involved to make that work? I'll write a follow-up post with more detail. Utilizing what's known as Cisco WebEx Hybrid Call Service the Cloud Video environment can be married to On-Premises Calling environment. While that is still an option, some folks have asked how they can bring their own PSTN by integrating with their existing on-premises Cisco Collaboration investment. Cisco has termed this type of company as a "Cisco Preferred Media Provider". That process involves starting a service contract with a telco provider that has an established relationship with Cisco WebEx. Then one would order new DIDs, assign a DID, and assign an internal number to a video endpoint. ![]() So what happens when you want to dial a PSTN telephone number? How do we associate a PSTN telephone number to a video device? Previously, the only option was to turn up a SIP trunk with a telco provider within the WebEx Control Hub. Most of the time folks don't type out the URIs so that's not usually a concern.) The URIs on WebEx are actually a bit longer. For example, I might set up a URI as for folks to reach me on a Cisco DX-80. This allows a video endpoint to call another endpoint or call into a WebEx meeting using a URI. Cisco's current line of Video endpoints (Room Kit, Room Kit Plus, SX, DX, MX, and WebEx Board) can be registered to the WebEx Calling Cloud for signaling and SIP URI dialing. ![]()
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