Extracting headers from REFER in dialplan?

11 Nov 2010

      Is there any way to extract additional headers from the dialplan when FS 
receives a REFER message?

The application I'm working on takes an incoming call, bridges it to 
another SIP server.  The SIP server does some things with the call, then 
sends a REFER message back to FS with an extra header that I would like 
to use in the dialplan.  The header shows in a trace, but not in any of 
the variables that I have access to.

For example, the REFER message looks something like this (numbers and 
addresses changed to protect the innocent):

    REFER 
sip:gw+testserver@192.168.1.95:5060;tport=tcp;transport=tcp;gw=testserver SIP/2.0
    FROM: <sip:4255551212@192.168.1.155>;epid=D4A38B23EF;tag=81a8713cf
    TO: <sip:testserver@192.168.1.155;transport=tcp>;tag=UNBQ363BgNvHa
    CSEQ: 1 REFER
    CALL-ID: b1aaff2e-6869-122e-53b9-001b216b53af
    MAX-FORWARDS: 70
    VIA: SIP/2.0/TCP 192.168.1.155:5060;branch=z9hG4bK606d7bc
    CONTACT: 
<sip:testing01:5060;transport=Tcp;maddr=192.168.1.155;ms-opaque=eaed293d6f65e314>;automata
    CONTENT-LENGTH: 0
    REFER-TO: <sip:14255551213@192.168.1.95>
    REFERRED-BY: <sip:4255551212@192.168.1.155>
    X-Information: my dog has fleas

I would then like to have something like this in the 4255551213 extension:

<action application="eval" 
data="${chat(jingle|testing@fs.jabber.server|agent@another.jabber.server|${caller_id_number} 
to Queue - ${variable_sip_h_X-Information})}"/>

The problem is the "X-Information" header is not exported by sofia as 
far as I can tell.

Is there any way to get this variable via the XML dialplan?

Thanks in advance.

  - Marc

Marc Lewis

Brian West

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