-- Accepting AUTHENTICATED call from [provider]:
       > requested format = ulaw,
       > requested prefs = (ulaw|gsm),
       > actual format = gsm,
       > host prefs = (gsm),
       > priority = mine
    -- Executing [[phone#]@DID_trunk_1:1] Goto("IAX2/trunk_1-2", "default|600|1") in new stack
    -- Goto (default,600,1)
    -- Executing [600@default:1] Macro("IAX2/trunk_1-2", "stdexten|600|SIP/600&IAX2/600") in new stack
    -- Executing [s@macro-stdexten:1] Dial("IAX2/trunk_1-2", "SIP/600&IAX2/600|20") in new stack
    -- Called 600
[Apr  6 16:46:46] WARNING[6816]: app_dial.c:1081 dial_exec_full: Unable to create channel of type 'IAX2' (cause 3 - No route to destination)
    -- Got SIP response 302 "Moved Temporarily" back from 10.1.1.114
    -- Now forwarding IAX2/trunk_1-2 to 'Local/24227542224133@numberplan-custom-1' (thanks to SIP/600-08203a58)
[Apr  6 16:46:46] NOTICE[6816]: chan_local.c:562 local_alloc: No such extension/context 24227542224133@numberplan-custom-1 creating local channel
[Apr  6 16:46:46] NOTICE[6816]: app_dial.c:497 wait_for_answer: Unable to create local channel for call forward to 'Local/24227542224133@numberplan-custom-1' (cause = 0)
  == Everyone is busy/congested at this time (2:0/0/2)
    -- Executing [s@macro-stdexten:2] Goto("IAX2/trunk_1-2", "s-CHANUNAVAIL|1") in new stack
    -- Goto (macro-stdexten,s-CHANUNAVAIL,1)
    -- Executing [s-CHANUNAVAIL@macro-stdexten:1] Goto("IAX2/trunk_1-2", "s-NOANSWER|1") in new stack
    -- Goto (macro-stdexten,s-NOANSWER,1)
    -- Executing [s-NOANSWER@macro-stdexten:1] VoiceMail("IAX2/trunk_1-2", "600|u") in new stack
    -- Playing '/var/spool/asterisk/voicemail/default/600/unavail' (language 'en')
  == Spawn extension (macro-stdexten, s-NOANSWER, 1) exited non-zero on 'IAX2/trunk_1-2' in macro 'stdexten'
  == Spawn extension (macro-stdexten, s-NOANSWER, 1) exited non-zero on 'IAX2/trunk_1-2'
    -- Hungup 'IAX2/trunk_1-2'