To change this behavior you have to comment out the following lines in asterisk/apps/app_pickup.c:

Lines 137-141:
======================================
/* strip the subchannel tag */
endptr = strrchr(evalchan, '/');
if(endptr) {
*endptr = '\0';
}
======================================

These lines transform a channel from ie. "SIP/40" to "SIP", thus making ALL ringing channels with the SIP protocol match the channels in the list. Not quite what's desired in our case.


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There seems to be an error:

If PickUpChan is used while two or more Channels are ringing, it always picks this channels which has last began to ring:

-- SIP/20-ca4a is ringing
-- SIP/40-4e9f is ringing
-- Executing PickupChan("SIP/10-a9f8", "SIP/20") in new stack
Nice channel, I'll take it: SIP
-- Channel SIP/10-a9f8 picked up ringing channel SIP/40-4e9f