User's Manual

Appendix A: Basic call flows 101
Copyright © 2003, Nortel Networks MCP SIP Application Module Basics
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Figure 2 Client-to-client voice plus video call flow
The following steps provide more detail about the call flow:
1. Client A sends an Invite to Client B.
2. Client B responds with 180 SDP (Session Description Protocol)
3. Client B responds with 200 OK.
Client B
SIP
Module
Application
User A:
[e-mail]1
Private:44-41111
(site code+station code)
Pubic: 972-684-1111
1. Invite sip:userB@domain1
To: userB@domain1
From: userA@domain1
SDP A
1. Invite sip:userB@domain1
To: userB@domain1
From: userA@domain1
SDP A
Call established between A and B (voice and video)
User B:
[e-mail]1
Private:44-41112
(site code+station code)
Pubic: 972-208-1234
2. 180 SDP B
2. 180 SDP B
3. 200 OK SDP B
3. 200 OK SDP B
4. Ack
4. Ack
5. Bye
5. Bye
6. 200 OK
6. 200 OK
Client A