Technical Reference; Sip Call Progression - ZyXEL Communications MAX-207HW2 User Manual

10.4 Technical Reference

The following section contains additional technical information about the WiMAX
Modem features described in this chapter.

10.4.1 SIP Call Progression

The following figure displays the basic steps in the setup and tear down of a SIP
call. A calls B.
Table 42 SIP Call Progression
A
1. INVITE
4. ACK
6. BYE
A sends a SIP INVITE request to B. This message is an invitation for B to
1
participate in a SIP telephone call.
B sends a response indicating that the telephone is ringing.
2
B sends an OK response after the call is answered.
3
A then sends an ACK message to acknowledge that B has answered the call.
4
Now A and B exchange voice media (talk).
5
After talking, A hangs up and sends a BYE request.
6
B replies with an OK response confirming receipt of the BYE request and the call is
7
terminated.
User's Guide
5.Dialogue (voice
traffic)
Chapter 10 The Service Configuration Screens
B
2. Ringing
3. OK
7. OK
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