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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16 | Cisco SIP IP phone B sends a SIP ACK to Cisco SIP IP | ||
| Cisco SIP IP phone C | phone C. The ACK confirms that Cisco SIP IP phone B has | |
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| received the 200 OK response from Cisco SIP IP phone A. | |
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A
Cisco SIP IP
Figure B-7 illustrates a successful call between Cisco SIP IP phones in which two parties are in a call and then one of the participants transfers the call to a third party without first contacting the third party. This is called a blind 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 transfers the call to User C.
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| Cisco SIP IP Phone 7960 Administrator Guide |
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