-- Executing Dial("SIP/200-aba9", "/18005551212") in new stack
May  2 12:38:15 WARNING[5794]: channel.c:2536 ast_request: No channel type registered for ''
May  2 12:38:15 NOTICE[5794]: app_dial.c:1029 dial_exec_full: Unable to create channel of type '' (cause 66 - Channel not implemented)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing BackGround("SIP/200-aba9", "warning") in new stack
    -- Playing 'warning' (language 'en')
    -- Executing Dial("SIP/200-aba9", "Zap/g1/18005551212") in new stack
    -- Called g1/18005551212
    -- Hungup 'Zap/1-1'
  == Spawn extension (internal, 18005551212, 3) exited non-zero on 'SIP/200-aba9'