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SIP Service Examples:
07. Call Forwarding Unconditional

Top Prev Next Start   Reader's guide
01. Call Hold  02. Consultation Hold  03. Music On Hold  04. Transfer: Unattended  05. Transfer: Attended  06. Transfer: Instant Messaging
07. Call Forwarding Unconditional  08. Call Forwarding Busy  09. Call Forwarding No Answer  10. 3-Way Conference: 3rd Party is Added
11. 3-Way Conference: 3rd Party Joins  12. Single Line Extension  13. Find-Me  14. Call Management (Incoming Call Screening)
15. Call Management (Outgoing Call Screening)  16. Call Park  17. Call Pickup  18. Automatic Redial  19. Click to Dial

In this scenario, Bob wants all calls forwarded to the PSTN:
  - Alice calls Bob via an outbound proxy server: (1)
  - The proxy server rewrites the Request URI, and forwards the INVITE to a Gateway: (2)
  - The session is established between Alice and Bob in the PSTN: (3) to (5)
  - Alice terminates the session with Bob: (6) to (7)
Details of messaging behind the Gateway are not shown.
Call Forwarding Unconditional
Top 1) INVITE (A2B) 2) 181 Call is Being Forwarded 3) 180 Ringing 4) 200 OK
Prev Next 5) ACK (A2B) 6) BYE (A2B) 7) 200 OK

Call Forwarding Unconditional
Top 1) INVITE (A2B) 2) 181 Call is Being Forwarded 3) 180 Ringing 4) 200 OK
Prev Next 5) ACK (A2B) 6) BYE (A2B) 7) 200 OK

Call Forwarding Unconditional
Top 1) INVITE (A2B) 2) 181 Call is Being Forwarded 3) 180 Ringing 4) 200 OK
Prev Next 5) ACK (A2B) 6) BYE (A2B) 7) 200 OK

Call Forwarding Unconditional
Top 1) INVITE (A2B) 2) 181 Call is Being Forwarded 3) 180 Ringing 4) 200 OK
Prev Next 5) ACK (A2B) 6) BYE (A2B) 7) 200 OK

Call Forwarding Unconditional
Top 1) INVITE (A2B) 2) 181 Call is Being Forwarded 3) 180 Ringing 4) 200 OK
Prev Next 5) ACK (A2B) 6) BYE (A2B) 7) 200 OK

Call Forwarding Unconditional
Top 1) INVITE (A2B) 2) 181 Call is Being Forwarded 3) 180 Ringing 4) 200 OK
Prev Next 5) ACK (A2B) 6) BYE (A2B) 7) 200 OK

Call Forwarding Unconditional
Top 1) INVITE (A2B) 2) 181 Call is Being Forwarded 3) 180 Ringing 4) 200 OK
Prev Next 5) ACK (A2B) 6) BYE (A2B) 7) 200 OK

Last update: November 19, 2009 
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