Re: [Asterisk-Users] Help with IAX , voice Distortion or Breakage.

[Alexey Ostrovsky]

Alexey Ostrovsky wrote:
Hello all,
We have the following problem:
When calling via iax, the sound is off after a while - most often 
after about 5 minutes (sometimes later or earlier) - at one end or at 
both ends. While the channel is up, and packages are still being 
transmitted, you just can't hear anything. Sometimes you can hear 
something just a little, but with the voice greatly distorted, 
sounding like a robot's voice.
This problem emerges whichever phone is called or whichever phone a 
call is made from (softphone, ipphone, local phones thru TDM cards)

System details:
- Linux Slackware 9.1 kernel 2.4.6
- CPU PIII 800
- RAM  500 Mb
- motherboard Asus TUSL-2c
- hard drive IDE
- Asterisk last cvs update
- 3 TDM400 cards - codec g729 voiceage
Help please.
May be somebody have same problem.
Thank you.
Some more information about that  problem.
Our system was tested with various codecs and protocols.
The results are as follows:
All calls one after another between two asterisk system (one in UA 
another in US).

IAX2/ulaw    -    5 calls    20-25  min  duration    ----    All OK
IAX2/gsm     -     after 10 min -  one-way  audio   -   channels up
                           30 min   -   OK
                           5 min  -   one-way  audio  -   channels up
                           20 min  -   one-way  audio  -  channels up
                           55 min   -  one-way  audio  -  channels up
                           30 min   -   OK
IAX2/g729           3 min  -   one-way  audio  -   channels up
                           15 min  -   one-way  audio  -  channels up
                           65 min   -  one-way  audio  -  channels up
                           30 min   -   OK
                           50 min  -   OK
IAX/ilbc               30 min  -   OK
                           35 min   -   OK
                           10 min   -   noise
                           30 min   -   OK
                           30 min  -  OK
SIP/gsm                30 min  -   OK
                           30  min  -   OK
                           10 min   -  one-way  audio  -  channels up
                           30 min   -  OK
                           7 min  -   one-way  audio  -  channels up
SIP/g729              30 min  -   one-way  audio  -  channels up
                           25  min  -   OK
                           10 min   -  one-way  audio  -  channels up
                           30 min   -  OK
                           12 min  -   one-way  audio  -  channels up
So,  as you see in my case ulaw  is better than others.   
But  it  is too much for my  net link. I have 256 kbit   DSL  now.

  
For now I am using  ilbc fore iax2.   
It  doesn't have a  "one-way  audio"   problem (for now) on our system.   
  
May be this will help to understand  what is wrong.  

Thanking you in advance,                             

--
Best regards,
        Alexey Ostrovsky
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