Appendix B SIP Call Flows
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| Call Flow Scenarios for Successful Calls |
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Step | Action | Description | |
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7 | At the request of Cisco SIP IP phone B, Cisco SIP IP | ||
| to Cisco SIP IP phone C | phone A sends a SIP INVITE request to Cisco SIP IP | |
| (Requested by Cisco SIP IP | phone C. The INVITE request is an invitation to User C to | |
| phone B) | participate in a call session. | |
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8 | 180 | Cisco SIP IP phone C sends a SIP 180 Ringing response to | |
| phone C to Cisco SIP IP phone A | Cisco SIP IP phone A. | |
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9 | 200 | Cisco SIP IP phone C sends a SIP 200 OK response to | |
| to Cisco SIP IP phone A | Cisco SIP IP phone A. The 200 OK response notifies Cisco | |
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| SIP IP phone A that the connection has been made. | |
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10 | Cisco SIP IP phone A sends a SIP ACK to Cisco SIP IP | ||
| Cisco SIP IP phone C | phone C. The ACK confirms that Cisco SIP IP phone A has | |
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| received the 200 OK response from Cisco SIP IP phone C. | |
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A
Cisco SIP IP
Figure B-8 illustrates a successful call between Cisco SIP IP phones in which two parties are in a call, one of the participants contacts a third party, and then that participant transfers the call to the third party. This is called an attended transfer. In this call flow scenario, the end users are User A, User B, and User C. They are all using Cisco SIP IP phones, which are connected via an IP network.
The call flow scenario is as follows:
1.User A calls User B.
2.User B answers the call.
3.User B calls User C and User C consents to take the call.
4.User B transfers the call to User C.
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| Cisco SIP IP Phone 7960 Administrator Guide |
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