Appendix A. Answers to Chapter-Ending Review Questions
Chapter 1
1 What are three tasks that a voice gateway performs?
Answer: Voice gateways perform some or all of the following tasks:
• Interfacing with the IP network and the PSTN or PBX
• Supporting IP call control protocols, in addition to TDM call control protocols
• Performing call setup and teardown for calls between the VoIP and PSTN networks by terminating and reoriginating the call media and signaling
• Providing supplementary services, such as call hold and transfer
• Relaying DTMF tones
• Supporting analog fax and modems over the IP network
2 What are two benefits of adding an IPIPGW between networks?
Answer: Placing an IPIPGW between networks gives added network privacy and additional ...
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