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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9 | 180 | Cisco SIP IP phone C sends a SIP 180 Ringing response to | |
| phone C to Cisco SIP IP phone B | Cisco SIP IP phone B. | |
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10 | 200 | Cisco SIP IP phone C sends a SIP 200 OK response to | |
| to Cisco SIP IP phone B | Cisco SIP IP phone B. The 200 OK response notifies Cisco | |
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| SIP IP phone B that the connection has been made. | |
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| If Cisco SIP IP phone B supports the media capability | |
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| advertised in the INVITE message sent by Cisco SIP IP | |
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| phone A, it advertises the intersection of its own and Cisco | |
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| SIP IP phone A’s media capability in the 200 OK response. | |
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| If Cisco SIP IP phone B does not support the media | |
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| capability advertised by Cisco SIP IP phone A, it sends | |
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| back a 400 Bad Request response with a 304 Warning | |
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| header field. | |
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11 | 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 C. | |
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| The ACK might contain a message body with the final | |
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| session description to be used by Cisco SIP IP phone C. If | |
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| the message body of the ACK is empty, Cisco SIP IP phone | |
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| C uses the session description in the INVITE request. | |
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A
12 | The call continues and then User B hangs up. Cisco SIP IP | |
| Cisco SIP IP phone C | phone B sends a SIP BYE request to Cisco SIP IP phone C. |
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| The BYE request indicates that User B wants to release the |
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| call. |
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13 | 200 | Cisco SIP IP phone C sends a SIP 200 OK message to |
| to Cisco SIP IP phone B | Cisco SIP IP phone B. The 200 OK response notifies Cisco |
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| SIP IP phone B that the BYE request has been received. |
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| The call session between User A and User B is now |
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| terminated. |
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The RTP channel between Cisco SIP IP phone B and Cisco SIP IP phone C is torn down.
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| Cisco SIP IP Phone 7960 Administrator Guide |
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