Configuration manual

334 Appendix L SIP
NN47923-501
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 [e-mail], then
VoIP-provider.com is the SIP service domain.
SIP Call Progression
Table 93 displays the basic steps in the setup and tear down of a SIP call. A calls
B.
1 A sends a SIP INVITE request to B. This message is an invitation for B to
participate in a SIP telephone call.
2 B sends a response indicating that the telephone is ringing.
3 B sends an OK response after the call is answered.
4 A then sends an ACK message to acknowledge that B has answered the call.
5 Now A and B exchange voice media (talk).
6 After talking, A hangs up and sends a BYE request.
7 B replies with an OK response confirming receipt of the BYE request and the
call is terminated.
Table 93 SIP Call Progression
AB
1. INVITE
2. Ringing
3. OK
4. ACK
5.Dialogue (voice traffic)
6. BYE
7. OK