Appendix B SIP Call Flows
Call Flow Scenarios for Successful Calls
Figure B-4 Cisco SIP IP Phone-to-Cisco SIP IP Phone Simple Call Hold
SIP IP | IP Network |
Phone User A |
IP
1.INVITE B
2.180 RINGING
3.200 OK
4.ACK
5.INVITE (c=IN IP4 0.0.0.0)
6.200 OK
7.ACK
A is on hold. The RTP channel between A and B is torn down.
8.INVITE (c=IN IP4
9.200 OK
10.ACK
A is taken off hold. The RTP channel between A and B is reestablished.
SIP IP
Phone User B
IP
41465
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