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Cisco 7960G Administrator's Manual page 117

Sip
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Appendix B
SIP Call Flows
Figure B-8
SIP IP
Phone User A
Step
Action
INVITE—Phone A to Phone B
1.
100 Trying—Phone B to
2.
Phone A
Call Transfer Without Consultation Using Failover
IP Network
IP
1. INVITE
2. 100 TRYING
3. 180 RINGING
4. 200 OK
5. ACK
2-way voice path
User B presses blind transfer.
6. INVITE (c=0.0.0.0)
7. 200 OK
8. ACK
User B dials user C.
9. REFER (Refer-To: C,Referred-By: B)
10. 501 NOT IMPLEMENTED
11. BYE(Also: C)
12. 200 OK
13. INVITE (Requested-By: B)
14. 100 TRYING
15. 180 RINGING
16. 200 OK
17. ACK
2-way voice path
Description
Phone A sends a SIP INVITE request to Phone B. 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.
•
Phone B sends a SIP 100 Trying response to Phone A. The response indicates that
the INVITE request has been received.
SIP IP
Phone User B
IP
Cisco SIP IP Phone Administrator Guide, Release 6.x and 7.x
Call Flow Scenarios for Successful Calls
SIP IP
Phone User C
IP
B-21

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