[Asterisk-Users] Support for SIP REFER message

[Gilbert Abboud]

Hi to all,

I am sending a SIP REFER message to Asterisk from a VoiceXML application using the <Transfer> element to do a Transfer through Asterisk. 
I need to know if Asterisk supports the full features of the SIP REFER message because if i set 'bridge=true'
in the <transfer> element of the VoiceXML application to supervise the call, Asterisk sends a NOTIFY message with 'subscription-state: terminated" to the VoiceXML application as if it was a blind transfer (bridge=false). 
Usually, when 'bridge=true' is set in the <transfer> element, the end point that receives the SIP REFER (i.e Asterisk) should send a SIP NOTIFY to the VoiceXML application with 'subscription-state: active' to let it supervise the call and then the endpoint should send Follow-On NOTIFY messages to let the VoiceXML application know the status of the call (no answer,busy,...). 

Thank you in advance for your help.

Gilbert Abboud
M.Eng. Computer Engineering
Programmer Analyst
Excendia, Montreal
ESN: 514-765-8490