[h323plus] simph323 - could not open sound device

[mattes]

I am trying to get simph323 to work, but I having some trouble w/ the audio.
Running h323plus-v1_21_0  with ptlib-2.4.5 on Linux.

I run the following command:

   simph323 -s "HDA Intel" -n h323:192.168.15.163

H323> Could not open sound device HDA Intel - Check permissions or full
duplex capability.
Could not open sound device HDA Intel - Check permissions or full duplex
capability.
In call with Kattanekm
Could not open sound device HDA Intel - Check permissions or full duplex
capability.
Could not open sound device HDA Intel - Check permissions or full duplex
capability.
....



running with trace enabled shows that the sound device is opened properly,
but then it fails shortly after

  0:04.512                H245:b7e3db90 H245    Default
OnSelectLogicalChannels, FastStartDisabled
  0:04.512                H245:b7e3db90 H323    FindCapability:
G.711-ALaw-64k <1>
  0:04.512                H245:b7e3db90 H323    Found capability:
G.711-ALaw-64k <4>
  0:04.513                H245:b7e3db90 H323    Selecting G.711-ALaw-64k <4>
  0:04.513                H245:b7e3db90 H245    Opening channel: T-103
  0:04.513                H245:b7e3db90 PWLib   File handle low water mark
set: 17 PUDPSocket
  0:04.514                H245:b7e3db90 RTP_UDP Session 1 created:
192.168.15.153:5002-5003 ssrc=2757625043
  0:04.514                H245:b7e3db90 RTP     Adding session RTP_UDP
  0:04.514                H245:b7e3db90 H323RTP Transmitter created using
session 1
  0:04.514                H245:b7e3db90 H323RTP OnSendingPDU
  0:04.514                H245:b7e3db90 RTP     OnSendingPDU
  0:04.514                H245:b7e3db90 Codec   G711 ALaw encoder created
for at 64k, 240 samples
  0:04.515                H245:b7e3db90 ALSA    Open this=0x0x9627ea8
  0:04.517                H245:b7e3db90 Alsa    Buffer time is 85312
  0:04.517                H245:b7e3db90 Alsa    Period time is 85312
  0:04.519                H245:b7e3db90 ALSA    Device plughw:0 Opened
  0:04.519                H245:b7e3db90 Codec   Opened sound channel "HDA
Intel" for recording at 8000 samples/second using 2x480 byte buffers.
  0:04.519                H245:b7e3db90 ALSA    setBuffers
this=0x0x9627ea8 oshandle=0x9626698 init 1
  0:04.519                H245:b7e3db90 psound  isOPen basechannel
0x0x9627ea8 pchannel os_handle=-1
  0:04.519                H245:b7e3db90 Codec   channel 0x0x96243a8 isOpen=0
Could not open sound device HDA Intel - Check permissions or full duplex
capability.
  0:04.519                H245:b7e3db90 LogChan Transmit thread aborted
(open fail) for G.711-ALaw-64k <4>
  0:04.519                H245:b7e3db90 H323    OnSelectLogicalChannels,
OpenLogicalChannel failed: G.711-ALaw-64k <4>


Some debugging later I noticed that H323EndPoint::OpenAudioChannel() calls
codec.AttachChannel() [codecs.cxx] and fails in channel->IsOpen().

Looking at ptlib/common/sound.cxx PSoundChannel it is
   baseChannel->PChannel::IsOpen() which returns FALSE

For a quick test I changed the line to
   baseChannel->IsOpen()
which makes it jump that hurdle and simph323 connects with the other h323
end and sound bits are exchanged.

Here is the thing that puzzles me!
I am using the same version of ptlib with opal (e.g. simpleopal) and
don't see this problem.
Code is build and run on the same machine.

Any thoughts?
mat