[Users] REFER To: (how to handle in OpenSER)

Klaus Darilion klaus.mailinglists at pernau.at
Wed Jul 12 10:07:05 CEST 2006

REFER is an end-2-end feature. Thus, After ua1 sends REFER to ua2 
(Refer-To: ua3), ua2 will create a new INVITE to ua3. You can not 
intercept the REFER in the SIP proxy and create an INVITE.

The only thing you might want to do in the proxy is to screen the URI in 
the Refer-To - e.g. to avoid that your subscribers are referred to 
costly service numbers.


Frogger wrote:
> I am trying to handle the REFER method for
> call-transfer and I need some assistance.
> What is the openser.cfg structure to handle a refer
> from ua1 to ua2 so that ua2 can call ua3?
> Basically, I am trying to establish a new INVITE with
> the REFER-To for ua2 calling ua3.  Also, I need to
> clean up the initial transaction between ua1 and ua2.
> BTW, I read the rfc on REFER and I have a good sense
> of whats supposed to happen but I lack the mechanics
> to make it so.
> All the guidance will be very helpful.  Thanks, F
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