-- Accepting AUTHENTICATED call from xxx.xxx.xxx.xxx:
       > requested format = ulaw,
       > requested prefs = (ulaw),
       > actual format = ulaw,
       > host prefs = (ulaw),
       > priority = mine
    -- Executing [5555555555@iaxdevice:1] Dial("IAX2/iaxdevice-3", "SIP/sip_provider/5555555555|20|D(123456789123456789)") in new stack
    -- Called sip_provider/5555555555
    -- SIP/sip_provider-09b30f70 is ringing
    -- SIP/sip_provider-09b30f70 is making progress passing it to IAX2iaxdevice-3
    -- SIP/sip_provider-09b30f70 answered IAX2/iaxdevice-3
    -- Sending DTMF '123456789' to the called party.
  == Spawn extension (iaxdevice, sip_provider, 1) exited non-zero on 'IAX2/iaxdevice-3'
    -- Hungup 'IAX2/iaxdevice-3'