ZyXEL P-2612HNU-F3F User Guide - Page 248
SIP Register Server, Pulse Code Modulation, SIP Call Progression
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Chapter 16 VoIP 3 Client device A then sends the call invitation to client device C. Figure 106 SIP Redirect Server 1 3 A 2 B 248 C SIP Register Server A SIP register server maintains a database of SIP identity-to-IP address (or domain name) mapping. The register server checks your user name and password when you register. RTP When you make a VoIP call using SIP, the RTP (Real time Transport Protocol) is used to handle voice data transfer. See RFC 3550 for details on RTP. Pulse Code Modulation Pulse Code Modulation (PCM) measures analog signal amplitudes at regular time intervals and converts them into bits. SIP Call Progression The following figure displays the basic steps in the setup and tear down of a SIP call. A calls B. Table 65 SIP Call Progression A 1. INVITE 4. ACK B 2. Ringing 3. OK P-2612HNU(L)-FxF User's Guide