[Asterisk-Users] chan_h323 passes no audio?

[Tony Mountifield]

I'm attempting to get chan_h323 working on Asterisk CVS-STABLE.
I've compiled it ok using the Janus release of pwlib/openh323, by
editing the makefile as per the comments.

Call setup and cleardown seems to work fine, but no audio is being
passed in either direction.

Doing an "h.323 trace 9", I noticed the following sequence at the end
of the call setup:

    h323.cxx(1685)  H225    Handling PDU: Connect callRef=13295
    h323.cxx(1925)  H225    Set protocol version to 4
    h323.cxx(2152)  H225    Set remote party name: "root [192.168.0.20]"
    h323.cxx(2160)  H225    Set remote application name: "The NuFone Network's H.323 Channel Driver for Asterisk    1.0.0 (OpenH323 v1.13.5)        9/61"
  h323ep.cxx(1992)  H225    Received connect PDU.
    h323.cxx(3205)  H245    Started control channel
 h323neg.cxx(540)   H245    TerminalCapabilitySet already sent.
    h323.cxx(3962)  H323    InternalEstablishedConnectionCheck: connectionState=HasExecutedSignalConnect fastStartState=FastStartDisabled
    h323.cxx(4019)  H245    Default OnSelectLogicalChannels, FastStartDisabled
h323caps.cxx(1814)  H323    FindCapability: G.711-ALaw-64k{sw} <1>
h323caps.cxx(1818)  H323    Found capability: G.711-ALaw-64k{sw} <1>
    h323.cxx(4066)  H323    Selecting G.711-ALaw-64k{sw} <1>
 h323neg.cxx(743)   H245    Opening channel: T-101
     rtp.cxx(1605)  RTP_UDP Session 1 created: 192.168.0.1:5000-5001 ssrc=2079793508
     rtp.cxx(1398)  RTP     Adding session RTP_UDP
channels.cxx(1048)  H323RTP Transmitter created using session 1
channels.cxx(893)   H323RTP OnSendingPDU
 h323rtp.cxx(193)   RTP     OnSendingPDU
  codecs.cxx(1271)  Codec   G711 ALaw encoder created for at 64k, 240 samples
  h323ep.cxx(2143)  Codec   Could not open sound channel "/dev/dsp" for recording: 
channels.cxx(1096)  LogChan Transmit thread aborted (open fail) for G.711-ALaw-64k{sw} <1>
    h323.cxx(4072)  H323    OnSelectLogicalChannels, OpenLogicalChannel failed: G.711-ALaw-64k{sw} <1>

Why does it want to open /dev/dsp? I'm not trying to play or record using
a local sound device, I just want to pass digital audio between Asterisk
and the network.

The second machine that I am testing this with, trying to get them to talk
to each other, doesn't have any sound hardware, and the third message from
last reads: Could not open sound channel "" for recording:

I assume it is these errors that are preventing audio from being passed.

Can anyone suggest how I might overcome this to make chan_h323 work?

Thanks
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org