Chapter 26

VoIP Call Routing

If I knew where the songs came from, I'd go there more often.

Leonard Cohen


The Global Switched Telephone Network (GSTN) connects callers in different places around the world. For this Voice service over IP (VoIP) services have received considerable attention in the past decade. This raises the issue of providing seamless voice service (and/or multimedia services) between the Internet and the public switched telephone network. In this chapter, we present call routing in this hybrid Internet-GSTN environment.


VoIP; SIP; IP multimedia system (IMS); address translation

Reading Guideline

While this chapter may be read independently, the reader is expected to be somewhat familiar with ...

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