[asterisk-users] Asterisk 14.2.1 PJSIP - is it possible to retrieve a PJSIP header To field for the SIP OK response to Trying?

Joshua Colp jcolp at digium.com
Tue Jan 24 11:42:44 CST 2017

On Tue, Jan 24, 2017, at 01:41 PM, Dan Cropp wrote:
> Thank you Joshua.
> So there is no way to retrieve header information which may come in on
> subsequent packages?
> If not, is there any way to make an Attended Transfer following the
> RFC5589?
> https://tools.ietf.org/html/rfc5589
> Asking because we have a hospital with a Cisco switch.  Hospital has two
> calls from their Cisco switch into an Asterisk box.  Operator handling
> the two calls and needs to transfer Call A to be connected to call B. 
> Can obviously be patched inside of Asterisk.  However, the hospital wants
> the call to be Attended Transferred. Basically, we need to send the
> Transfer (REFER) with the Replaces containing the call ID, From tag, and
> the To Tag.
> I am able to gather everything needed for the REFER field and pass that
> to the Transfer command (via AMI), except the To tag. 

There isn't that I can think of. Even if you are able to construct such
a REFER I'm not sure what exactly will happen inside of Asterisk with
the legs.

Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org

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