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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5 | 486 Busy | Cisco SIP IP phone B sends a 486 Busy here message to the | |
| phone B to SIP proxy server | SIP proxy server. The message indicates that Cisco SIP IP | |
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| phone B is in use and the user is not willing or able to take | |
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| additional calls. | |
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6 | SIP proxy server forwards the SIP ACK to the Cisco SIP IP | ||
| SIP IP phone B | phone B. The ACK confirms that the SIP proxy server has | |
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| received the 486 Busy here response from Cisco SIP IP | |
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| phone B. | |
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7 | 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 | |
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| to 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 SIP proxy server | the SIP proxy server | |
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9 | 200 | Cisco SIP IP phone C sends a SIP 200 OK response to the | |
| to SIP proxy server | SIP proxy server. | |
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10 | 200 | SIP proxy server forwards the SIP 200 OK response to | |
| Cisco SIP IP phone A | Cisco SIP IP phone A. | |
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11 | 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 | |
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| received the 200 OK response from Cisco SIP IP phone C. | |
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12 | 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 | |
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| received the 200 OK response from Cisco SIP IP phone C. | |
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| Cisco SIP IP Phone 7960 Administrator Guide |
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