Cisco 7960G Administrator's Manual page 128
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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
Figure B-11 Network Call Forwarding (Unconditional)
SIP IP
Phone
User A
2-way RTP channel
Step
Action
1.
INVITE—Phone A to SIP proxy
server
2.
INVITE—SIP proxy server to
SIP redirect server
Cisco SIP IP Phone Administrator Guide, Release 6.x and 7.x
B-32
IP
Proxy
Server
1. INVITE B
8. 200 OK
9. ACK
Description
Phone A sends a SIP INVITE request to the SIP proxy server. The request is an
invitation to User B to participate in a call session. In the INVITE request:
The phone number of User B is inserted in the Request-URI field in the form
•
of a SIP URL. The SIP URL identifies the address of User B and takes a form
similar to an e-mail address (user@host, where user is the telephone number
and host is either a domain name or a numeric network address). For example,
the Request-URI field in the INVITE request to User B appears as "INVITE
sip:555-0199@companyb.com; user=phone." The "user=phone" parameter
distinquishes that the Request-URI address is a telephone number rather than
a username.
Phone A is identified as the call session initiator in the From field.
•
A unique numeric identifier is assigned to the call and is inserted in the
•
Call-ID field.
The transaction number within a single call leg is identified in the CSeq field.
•
The media capability User A is ready to receive is specified.
•
The SIP proxy server sends the SIP INVITE request to the SIP redirect server.
IP Network
Redirect
Server
2. INVITE B
3. 302 Moved Temporarily
4. ACK
5. INVITE C
6. 180 Ringing
7. 200 OK
10. ACK
Appendix B
SIP Call Flows
IP
IP
SIP IP
SIP IP
Phone
Phone
User B
User C
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