Verbosity is at least 4
    -- Executing Answer("SIP/2000-32ff", "") in new stack
    -- Executing Wait("SIP/2000-32ff", "1") in new stack
    -- Executing Playback("SIP/2000-32ff", "vm-goodbye") in new stack
    -- Playing 'vm-goodbye' (language 'en')
    -- Executing Authenticate("SIP/2000-32ff", "5678") in new stack
    -- Playing 'agent-pass' (language 'en')
    -- Playing 'auth-thankyou' (language 'en')
    -- Executing MeetMe("SIP/2000-32ff", "18|p") in new stack
  == Parsing '/etc/asterisk/meetme.conf': Found
Apr  6 21:57:05 WARNING[14337]: chan_zap.c:1069 zt_open: Unable to open '/dev/zap/pseudo': No such device
Apr  6 21:57:05 ERROR[14337]: chan_zap.c:7643 chandup: Unable to dup channel: No such device
Apr  6 21:57:05 WARNING[14337]: app_meetme.c:461 build_conf: Unable to open pseudo channel - trying device
Apr  6 21:57:05 WARNING[14337]: app_meetme.c:464 build_conf: Unable to open pseudo device
    -- Playing 'conf-invalid' (language 'en')
  == Spawn extension (default, 18, 5) exited non-zero on 'SIP/2000-32ff'
    -- Executing Hangup("SIP/2000-32ff", "") in new stack
  == Spawn extension (default, h, 1) exited non-zero on 'SIP/2000-32ff'