Hi all. I make a call to FS callcenter using webRTC. Now I would like to add some additional data to the header. That I did by using extraheaders. Now all that is good. I can see the custom header in the sip trace on freeswitch. For e.g in sip.js I add: var options = { extraHeaders: [ 'a: foo' ] }; on FS i get: INVITE sip:900@anonymous.invalid SIP/2.0 Via: SIP/2.0/WS 9jscv0q24s4m.invalid;branch=z9hG4bK1002472 Max-Forwards: 70 To: <sip:900@anonymous.invalid> From: <sip:anonymous.hfsqa4@anonymous.invalid>;tag=depmif1fo5 Call-ID: l5pieavpjguoset7ugvd CSeq: 1458 INVITE * a: foo* Contact: <sip:8rgi365g@9jscv0q24s4m.invalid;transport=ws;ob> Allow: ACK,CANCEL,BYE,OPTIONS,INVITE,MESSAGE Content-Type: application/sdp Contact: <sip:8rgi365g@9jscv0q24s4m.invalid;transport=ws;ob> Allow: ACK,CANCEL,BYE,OPTIONS,INVITE,MESSAGE Content-Type: application/sdp Supported: outbound User-Agent: SIP.js/0.5.0 Content-Length: 3636 How do I access it in the dialplan? I tried ${sip_h_X-a} but it didnt't work. Help please?