I call an extension in the trunk, pass some headers to it to validate some transactions. Trunk responses my invite with "SIP/2.0 480 Temporarily Unavailable" (not user response) with some headers like below: recv 906 bytes from udp/[dst.dst.dst.dst]:8090 at 05:02:33.558626: ------------------------------------------------------------------------ SIP/2.0 480 Temporarily Unavailable From: ""<sip:TCAPI_User@dst.dst.dst.dst:8090>;tag=8SN0g1DmHy0NF To: <sip:91001@dst.dst.dst.dst :8090>;tag=59f1478-33001dac-1f9a-50022-1f428f-b29b56e-1f428f Call-ID: 96685221-f5e9-1231-b1a5-000c29ae8315 CSeq: 54415412 INVITE Via: SIP/2.0/UDP src.src.src.src:5080;rport=5080;branch=z9hG4bKtScUQtUy9rgmp Supported: replaces Info: {"MerCode":"102"} Sign: Ley1/8cOufqkgd7JuGR7f+jiVxSRM= BillPaymentList: {"paymentID":"16596500682","result":"0"} Content-Length: 0 I run /event plain all in my fs console and no variable exists like info, sign and billpayment in channel variables. Any solution to catch response header?! I cannot define or change key of the headers. I should adapt to these keys!!!