Network Call Forwarding (Unconditional - Cisco 7960G Administrator's Manual
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Also See for 7960G:
- Administration manual (184 pages) ,
- User manual (122 pages) ,
- Phone manual (74 pages)
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Appendix B
SIP Call Flows
Step
Action
20.
200 OK—Phone A to Phone B
21.
BYE—Phone B to Phone C
200 OK—Phone C to Phone B
22.
INVITE—Phone A to Phone C
23.
100 Trying—Phone C to Phone A
24.
180 Ringing—Phone C to Phone A Phone C sends a SIP 180 Ringing response to Phone A.
25.
26.
200 OK—Phone C to Phone A
27.
ACK—Phone A to Phone C
A two-way RTP channel is established between Phone A and Phone C.
Network Call Forwarding (Unconditional)
Figure B-11
requested unconditional call forwarding from the network. When User A calls User B, the call is
immediately transferred to Phone C. 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.
2.
3.
Description
Phone A sends a SIP 200 OK response to Phone B. The response notifies
Phone B that the BYE request has been received.
Phone B sends a SIP BYE request to Phone C.
Phone C sends a SIP 200 OK response to Phone B. The response notifies
Phone B that the BYE request has been received.
Phone A sends a SIP INVITE request to Phone C. The request contains the
following information:
Requested-By: B
•
The message indicates that the INVITE was requested by Phone B.
Phone C sends a SIP 100 Trying response to Phone A. The response indicates
that the INVITE request has been received.
Phone C sends a SIP 200 OK response to Phone A. The response notifies
Phone A that the connection has been made.
Phone A sends a SIP ACK to Phone C. The ACK confirms that Phone A has
received the 200 OK response from Phone C.
illustrates successful call forwarding between Cisco SIP IP phones in which User B has
User B requests that the network forward all calls to Phone C.
User A calls User B.
The network transfers the call to Phone C.
Call Flow Scenarios for Successful Calls
Cisco SIP IP Phone Administrator Guide, Release 6.x and 7.x
B-31
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