Something

rebelPBX*CLI> dial 129@House
    -- Executing Dial("OSS/dsp", "SIP/Polycom") in new stack
    -- Called Polycom
    -- SIP/Polycom-2a1e is ringing
  == Console is full duplex
rebelPBX*CLI> hangup
  == Spawn extension (House, 129, 1) exited non-zero on 'OSS/dsp'
 << Hangup on console >>
Mar 27 17:57:07 WARNING[22300]: chan_oss.c:533 sound_thread: select failed: Bad file descriptor