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 ...