############### zapata.conf
fxoks=1

############### extentions.conf

exten => 999,1,Answer()
exten => 999,2,Dial(Zap/4/80504452905)

############### DEBUG

Executing [999@default:1] Answer("SIP/100-081b6298", "") in new stack
    -- Executing [999@default:2] Dial("SIP/100-081b6298", "Zap/4/80504452905") in new stack
[Oct  3 16:58:47] WARNING[5071]: app_dial.c:1077 dial_exec_full: Unable to create channel of type 'Zap' (cause 0 - Unknown)
  == Everyone is busy/congested at this time (1:0/0/1)