ZyXEL P-2602R-D1A User Guide - Page 152
SIP Call Progression, SIP Servers
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P-2602H(W)(L)-DxA Series User's Guide 11.2.1.2 SIP Service Domain The SIP service domain of the VoIP service provider is the domain name in a SIP URI. For example, if the SIP address is [email protected], then "VoIP-provider.com" is the SIP service domain. 11.2.2 SIP Call Progression The following figure displays the basic steps in the setup and tear down of a SIP call. A calls B. Table 52 SIP Call Progression A 1. INVITE 4. ACK 6. BYE 5.Dialogue (voice traffic) B 2. Ringing 3. OK 7. OK A sends a SIP INVITE request to B. This message is an invitation for B to participate in a SIP telephone call. 6 B sends a response indicating that the telephone is ringing. 7 B sends an OK response after the call is answered. 8 A then sends an ACK message to acknowledge that B has answered the call. 9 Now A and B exchange voice media (talk). 10After talking, A hangs up and sends a BYE request. 11B replies with an OK response confirming receipt of the BYE request and the call is terminated. 11.2.3 SIP Servers SIP is a client-server protocol. A SIP client is an application program or device that sends SIP requests. A SIP server responds to the SIP requests. When you use SIP to make a VoIP call, it originates at a client and terminates at a server. A SIP client could be a computer or a SIP phone. One device can act as both a SIP client and a SIP server. 152 Chapter 11 Voice