Hi,

 

The draft  - draft-roach-sip-acb-00.txt, explains the Automatic Call Back (ACB) Service in SIP with examples. This implementation moves the feature inteligence to the SIP end users. The SUBSCRIBE/ NOTIFY will be transacted between the End Users.

 

I am planing to have this feature as a centralized one. This means, ACB application will run over the SIP Proxy and all the end users can access

this feature. The inteligence will be centralized. Please see the figure below.

 

 

User1         Proxy         User2         Application

             

       1 Invite      2 Invite

 


                                    3 Busy

            4 Busy                                     

                                                           

            5 Registr ACB

            at Usr2

                                                6 Registers for Application

 


                                    7 If Usr2 sends BYE, let me know          

 


                                    8 BYE

 

                                    9 Usr2 released the call

Start 3rd party Application, establish call between Usr1 and Usr2.

 
 

 

 

 

 

 

 


 

In the figure I am interested in Msg 5 only. Upon receiving the Msg-5, the Proxy will send this information to Application. The Msg 5 must be a feature stimulus method. Similar methods will be useful while activating/de-activating the features over the signaling path in SIP.

 

Can anybody please suggest the SIP methods/ Fields that can be used for this

purpose? please send me the document details if any, available?

 

I would appreciate the help in this regard.

 

Regards,

Prasanna

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