chan_sip Channel Variables

${SIPCALLID} * - SIP Call-ID: header verbatim (for logging or CDR matching)
${SIPDOMAIN} * - SIP destination domain of an inbound call (if appropriate)
${SIPFROMDOMAIN} - Set SIP domain portion of From header on outbound calls
${SIPUSERAGENT} * - SIP user agent (deprecated)
${SIPURI} * - SIP uri
${SIP_MAX_FORWARDS} - Set the value of the Max-Forwards header for outbound call
${SIP_CODEC} - Set the SIP codec for an inbound call
${SIP_CODEC_INBOUND} - Set the SIP codec for an inbound call
${SIP_CODEC_OUTBOUND} - Set the SIP codec for an outbound call
${SIP_URI_OPTIONS} * - additional options to add to the URI for an outgoing call
${RTPAUDIOQOS} - RTCP QoS report for the audio of this call
${RTPVIDEOQOS} - RTCP QoS report for the video of this call