Appendix B SIP Call Flows
|
| Call Flow Scenarios for Successful Calls |
|
|
|
| |
Step | Action | Description | |
|
|
| |
6 | 180 | SIP proxy server sends a SIP 180 Ringing response to | |
| to Cisco SIP IP phone A | Cisco SIP IP phone A. | |
|
|
| |
The timeout expires before the phone is answered. | |||
|
|
| |
7 | CANCEL (Ring | SIP proxy server sends a CANCEL request to Cisco SIP IP | |
| proxy server to Cisco SIP IP | phone B to cancel the invitation. | |
| phone B |
|
|
|
|
| |
8 | 200 | Cisco SIP IP phone B sends a SIP 200 OK response to the | |
| to SIP proxy server | SIP proxy server. The response confirms receipt of the | |
|
| cancellation request. | |
|
|
| |
9 | SIP proxy server sends a SIP INVITE request to Cisco SIP | ||
| Cisco SIP IP phone C | IP phone C. The INVITE request is an invitation to User C | |
|
| to participate in a call session. | |
|
|
| |
10 | 180 | Cisco SIP IP phone C sends a SIP 180 Ringing response to | |
| phone C to SIP proxy server | the SIP proxy server | |
|
|
| |
11 | 200 | Cisco SIP IP phone C sends a SIP 200 OK response to the | |
| to SIP proxy server | SIP proxy server. | |
|
|
| |
12 | 200 | SIP proxy server forwards the SIP 200 OK response to | |
| Cisco SIP IP phone A | Cisco SIP IP phone A. | |
|
|
| |
13 | Cisco SIP IP phone A sends a SIP ACK to the SIP proxy | ||
| SIP proxy server | server. The ACK confirms that Cisco SIP IP phone A has | |
|
| received the 200 OK response from Cisco SIP IP phone C. | |
|
|
| |
14 | SIP proxy server forwards the SIP ACK to the Cisco SIP IP | ||
| SIP IP phone C | phone C. The ACK confirms that Cisco SIP IP phone A has | |
|
| received the 200 OK response from Cisco SIP IP phone C. | |
|
|
|
|
|
| Cisco SIP IP Phone 7960 Administrator Guide |
|
|
|
|
| ||
|
|
|
| |
|
|
|
