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Understanding Session Border Controllers: Comprehensive Guide to Designing, Deploying, Troubleshooting, and Maintaining Cisco Unified Border Element (CUBE) Solutions by Gonzalo Salgueiro, Kaustubh Inamdar, Steve Holl, Chidambaram Arunachalam, Arunachalam Chidambaram, Kyzer Davis, Felipe Garrido

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Chapter 4

Signaling and Interworking

SBCs are often the demarcation point between many different real-time multimedia networks. When interconnecting two real-time communication networks, more often than not, there is a significant chance of encountering interoperability issues. For example, the two networks might support different call control protocols, different extensions within the same call control protocol, different media encoding formats, different media format packetization periods, different methods of dual-tone multifrequency (DTMF) relay, different media encryption schemes, or different IP addressing versions.

Many of the endpoints initiating and terminating communication sessions don’t natively have the ability to address interoperability ...

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