User's Manual

Appendix A: Basic call flows 103
Copyright © 2003, Nortel Networks MCP SIP Application Module Basics
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Figure 4 Call transfer (blind) to client call flow
Client B
SIP
Module
Application
Client A
Client C
Call established between A and B
2. Invite (hold)
3. 200 OK
5. Ack
8. Refer (to C)
10. 202 (accepted)
11. Invite (to C)
15. 200 OK
16. Ack
20. Notify (200 OK)
21. 200 OK
1. Invite (hold)
4. 200 OK
6. Ack
7. Refer (to C)
9. 202 (accepted)
12. Invite (to C)
13. 200 OK
17. Set up
22. 200 OK
19. Notify (200 OK)
18. Ack
23. Bye
Call established between A and C
24. Bye
25. 200 OK
26. 200 OK
Call established between B and C
14. 180 Ringing