Cisco 7960G Administrator's Manual page 100
Sip
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Also See for 7960G:
- Administration manual (184 pages) ,
- User manual (122 pages) ,
- Phone manual (74 pages)
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Call Flow Scenarios for Successful Calls
Step
Action
14.
200 OK—Gateway 1 to Cisco SIP IP phone
15.
Release Complete—Gateway 1 to PBX A
Call Setup and Hold
Figure B-2
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.
4.
Figure B-2
User A
Cisco SIP IP Phone Administrator Guide, Release 6.x and 7.x
B-4
illustrates a successful phone-call setup and call hold. In this scenario, the two end users are
User A calls User B.
User B answers the call.
User B puts User A on hold.
User B takes User A off hold.
Successful Call Setup and Hold
PBX A
1. Setup
3. Call Proceeding
6. Alerting
8. Connect
10. Connect ACK
2-way voice path
2-way voice path
Description
Gateway 1 sends a SIP 200 OK response to the phone. The response
notifies the phone that Gateway 1 has received the BYE request.
Gateway 1 sends a Release Complete message to PBX A, and the call
session terminates.
GW1
IP Network
2. INVITE
4. 100 Trying
5. 180 Ringing
7. 200 OK
9. ACK
2-way RTP channel
11. INVITE (c=IN IP4 0.0.0.0)
12. 200 OK
13. ACK
No RTP packets being sent
14. INVITE (c=IN IP4 IP-User B)
15. 200 OK
16. ACK
2-way VP
Appendix B
SIP Call Flows
SIP IP Phone
User B
IP
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