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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 3

Call Routing

Taking advantage of a digital assistant (“Siri, call Cisco TAC”) is now an easy way to call family, friends, and businesses. Though this engagement may seem simple, a plethora of technical operations are happening in the background to make this call routing magic occur. This chapter provides insights into how SBCs play a role in routing calls across enterprise and service provider networks.

This chapter consists of the following sections:

  • Dialing and Routing a SIP Call—This section introduces dialing concepts based on telephone number and uniform resource identifiers (URIs). It also takes a detailed protocol-level look at how a SIP call originates and routes across SIP devices.

  • Call Routing Types—This section discusses ...

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