*CLI>
    -- Executing Dial("SIP/5004-c4d7", "Zap/g1/0619992086") in new stack
    -- Requested transfer capability: 0x00 - SPEECH
    -- Called g1/0619992086
    -- Channel 0/1, span 1 got hangup
Jun 29 16:25:40 WARNING[1423]: app_dial.c:426 wait_for_answer: Unable to forward voice
    -- Hungup 'Zap/1-1'
  == No one is available to answer at this time

*CLI>