*CLI>     -- Executing Dial("SIP/106-0819c6c0", "Zap/g1/18473124567") in new stack
Nov  8 22:41:42 NOTICE[17880]: app_dial.c:1056 dial_exec_full: Unable to create channel of type 'Zap' (cause 0 - Unknown)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing Hangup("SIP/106-0819c6c0", "") in new stack
  == Spawn extension (default, 18473124567, 2) exited non-zero on 'SIP/106-0819c6c0'




sun-pbx:/etc/asterisk # cat zapata.conf
[channels]
context=default
loadzone = us
defaultzone = us
fxsks = 1-4


macro in extensions.conf
[macro-oneline]
exten => s,1,Dial(Zap/g1/${ARG1},20,t)
exten => s,2,Voicemail(u${MACRO_EXTEN})
exten => s,3,Hangup
exten => s,102,Voicemail(b${MACRO_EXTEN})
exten => s,103,Hangup