Appendix B SIP Call Flows
Call Flow Scenarios for Failed Calls
Figure B-15 illustrates an unsuccessful call in which User A initiates a call to User B and receives a class 4xx, 5xx, or 6xx response.
Figure B-15 Gateway-to-Cisco SIP IP Phone—Client, Server, or Global Error
User A PBX A | GW1 |
| IP Network | |
|
|
|
|
|
SIP IP Phone
User B
IP
1. Setup
3. Call Proceeding
6.Disconnect
7.Release
9. Release Complete
2.INVITE
4.100 Trying
5.4xx/5xx/6xx Failure
8. ACK
41727
|
| Cisco SIP IP Phone 7960 Administrator Guide |
|
|
|
|
| ||
|
|
|
| |
|
|
|
