Name
NBScat() — Plays an NBS local stream
Uses the nbscat8k
      program to listen to the local Network Broadcast Sound (NBS) stream.
      (For more information, see the nbs module in
      Digium’s Subversion server.) The caller can exit by pressing any
      key.
Returns -1 on hangup;
      otherwise, does not return.
exten => 123,1,Answer()
exten => 123,2,NBScat()