Gateway To Cisco Sip Ip Phone In A Sip Network; Call Setup And Disconnect; Call Setup And Hold; Call To A Gateway Acting As An Emergency Proxy From A Cisco Sip Ip Phone - Cisco 7960G Administrator's Manual

Call Flow Scenarios for Successful Calls

Gateway to Cisco SIP IP Phone in a SIP Network

The following scenarios describe and illustrate successful calls in a gateway to a Cisco SIP IP phone:
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Call Setup and Disconnect

Figure B-1
are User A and User B. User A is located at PBX A. PBX A is connected to Gateway 1 (SIP gateway)
via a T1/E1. User B is located at a Cisco SIP IP phone. Gateway 1 is connected to the Cisco SIP IP phone
over an IP network.
The call flow is as follows:
1.
2.
3.
Figure B-1
User A
Cisco SIP IP Phone Administrator Guide, Release 6.x and 7.x
B-2
Call Setup and Disconnect, page B-2
Call Setup and Hold, page B-4
Call to a Gateway Acting As an Emergency Proxy from a Cisco SIP IP Phone, page B-6
illustrates a successful phone-call setup and disconnect. In this scenario, the two end users
User A calls User B.
User B answers the call.
User B hangs up.
Successful Setup and Disconnect
PBX A
1. Setup
3. Call Proceeding
6. Alerting
8. Connect
9. Connect ACK
2-way voice path
12. Disconnect
13. Release
15. Release Complete
GW1 IP Network
2. INVITE
4. 100 Trying
5. 180 Ringing
7. 200 OK
10. ACK
2-way RTP channel
11. BYE
14. 200 OK
Appendix B SIP Call Flows
SIP IP Phone
User B
IP