Internet Communications Using SIP : Delivering VoIP and Multimedia Services With Session Initiation Protocol {2Nd Ed.}

Figure 19.7 Call flows for a scheduled conference.

1 HTTP POST

WEB A B SCHEDULER MIXER

3 INVITE

4 INVITE

1 - Web server informs

controller of scheduled

conference

2 - E-mail to A and

B announces conference

4 - User B joins

conference

3 - User A joins

conference

8 ACK

10 INVITE

14 ACK

2 200 OK

9 INVITE

13 ACK

7 ACK

5 200 OK

11 200 OK

12 200 OK

6 200 OK

336 Chapter 19