-- Executing Dial("SIP/106-0817afa8", "zap/G1/131166|120|wW") in new stack
    -- Requested transfer capability: 0x00 - SPEECH
    -- Called G1/131166
  == Primary D-Channel on span 1 down
May 27 11:18:43 WARNING[7701]: chan_zap.c:2445 pri_find_dchan: No D-channels available!  Using Primary channel 16 as D-channel anyway!
May 27 11:18:43 WARNING[8137]: app_dial.c:719 wait_for_answer: Unable to forward voice
    -- Hungup 'Zap/31-1'
  == Everyone is busy/congested at this time (1:0/0/1)
  == Primary D-Channel on span 1 down
May 27 11:18:46 WARNING[7701]: chan_zap.c:2445 pri_find_dchan: No D-channels available!  Using Primary channel 16 as D-channel anyway!
    -- Executing Hangup("SIP/106-0817afa8", "") in new stack
  == Spawn extension (dial-special, h, 1) exited non-zero on 'SIP/106-0817afa8'