[asterisk-users] G723 problems with TC400B

[Jovanny Saravia]

Hello asteriskers, I hope someone could help me ... !!

I bought a TC400B, and I am testing doing calls with G729 and G723.

When I used G729 it works fine, but when I try to use G723 the RTP has very
low quality and is not possible to hear to the other person in the phone.

I try to find out the problem but the only weird that I saw in the debug
info is this line (using asterisk 1.2.17):

asterisk*CLI> Apr 15 19:42:44 WARNING[17321] chan_zap.c: Frame too large
Apr 15 19:42:48 WARNING[17321]: chan_zap.c:4931 zt_write: Frame too large

This is my scenario:

- 1 Intel(R) Core(TM)2 CPU (Core 2 Duo with 2.13GHz)
- 1 Gigabit Memory
- kernel  2.6.18-1.2798.fc6 x86_64
- OS: Fedora Core 6

I tried first with asterisk 1.4.1 and its dependencies but the problem is
there, too much noise when someone speeaks (poor voice quality).

In asterisk 1.2.17 and its dependencies (libpri, zaptel and addons) is a
little better but the voice quality is not good anyway. In this scenario
appears the Warning : Frame too large.

The show transcoders and show translations looks fine in asterisk CLI:
asterisk*CLI> show transcoder
0/0 encoders/decoders of 92 channels (G.729a / G.723.1 5.3 kbps) are in use.

asterisk*CLI> show translation
         Translation times between formats (in milliseconds)
          Source Format (Rows) Destination Format(Columns)

         g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
   g723     -     4     1     1     3     3     2     5     2     -    14
    gsm     3     -     2     2     2     2     1     4     3     -    13
   ulaw     1     3     -     1     2     2     1     4     1     -    13
   alaw     1     3     1     -     2     2     1     4     1     -    13
   g726     3     3     2     2     -     2     1     4     3     -    13
  adpcm     3     3     2     2     2     -     1     4     3     -    13
   slin     2     2     1     1     1     1     -     3     2     -    12
  lpc10     4     4     3     3     3     3     2     -     4     -    14
   g729     2     4     1     1     3     3     2     5     -     -    14
  speex     -     -     -     -     -     -     -     -     -     -     -
   ilbc     4     4     3     3     3     3     2     5     4     -     -
asterisk*CLI>

After of this I upgrade the kernel to 2.6.20-1.2944.fc6 x86_64, and the
problem remains.

Any help will be so much appreciated.

-- 
Jovanny Saravia
Solutions Manager
e-solutions Ltda
jovanny.saravia at gmail.com
+57-310-7676163
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