This chapter covers the following topics:
Chapter 7, “Design and Implementation Considerations,” discussed a series of network design and implementation considerations you should work through when connecting a service provider Session Initiation Protocol (SIP) trunk into your network. This chapter explores an additional set of considerations regarding interworking.
When all external Public Switched Telephone Network (PSTN) calls to the enterprise were Time Division Multiplexing (TDM) and only internal calls used IP, the enterprise network designer was in complete control of the following:
• Which IP user endpoints communicated with each other and the compatibility ...