Hooking for fun and income

FreePBX Tips and Tricks
6

I don’t think this is a bug. The channel variable custom is used by FreePBX dialplan to identify trunks of type custom. The fact that it is populated with the peer name of chan_sip trunks is a byproduct not its intent.

There is a supportable way to determine the trunk name without relying on custom:

  1. Determine value of channel var DIAL_TRUNK, it will be an integer
  2. Determine value of global var OUT_${DIAL_TRUNK} this will be the trunk tech/name if SIP or IAX but will only be the tech if PJSIP.
  3. If value from 2 == “PJSIP” then the trunk name will be in global variable OUT_${DIAL_TRUNK}_SUFFIX in the format @trunkname

Distilling the above:

exten => s,n,ExecIF($["${OUT_${DIAL_TRUNK}_SUFFIX}"!=""]?Set(trunk_name=${OUT_${DIAL_TRUNK}_SUFFIX}):Set(trunk_name=${OUT_${DIAL_TRUNK}}))
exten => s,n,Noop(trunk name: ${trunk_name})
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