Sip Service Domain; Sip Call Progression; Table 97 Sip Call Progression - Nortel 222 User Manual

338 Appendix M SIP

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 1122334455@VoIP-provider.com, then
VoIP-provider.com is the SIP service domain.

SIP Call Progression

Table 97
B.

Table 97 SIP Call Progression

A
1. INVITE
4. ACK
6. BYE
1
2
3
4
5
6
7
NN47922-501
displays the basic steps in the setup and tear down of a SIP call. A calls
5.Dialogue (voice traffic)
A sends a SIP INVITE request to B. This message is an invitation for B to
participate in a SIP telephone call.
B sends a response indicating that the telephone is ringing.
B sends an OK response after the call is answered.
A then sends an ACK message to acknowledge that B has answered the call.
Now A and B exchange voice media (talk).
After talking, A hangs up and sends a BYE request.
B replies with an OK response confirming receipt of the BYE request and the
call is terminated.
B
2. Ringing
3. OK
7. OK