[asterisk-users] Understand SIP REFER

[Klaus Darilion]

Hi!

I have some problems understanding the concept of REFER in Asterisk 1.4.23.

I have the following scenario:

Incoming SIP call (incoming leg) from a SIP trunk into Asterisk (handled 
in context fromTrunk), forwarded to the SIP Client (outgoing leg).

Now, the SIP Client sends a REFER request (unattended transfer) to 
another extension. This terminates the outgoing leg and the incoming leg 
continues dialplan processing in the context of the SIP client 
(fromSipClient).

Processing in the client's context is IMO fine, but the problem is that 
the channel is the incoming channel from the trunk. So the fromSipClient 
is processed by the trunk channel. This in my case does not work as it 
expects to have certain variables set (setvar in sip.conf) - but these 
variables are not present as the new extension is executed by the 
trunk's channel.

I it possible to execute the second call setup completely in the SIP 
clients settings (e.g. loading the clients setvar options)?

regards
klaus