[asterisk-users] Poor audio quality with TDM400 card

[Noah Miller]

Hi Leotis -

> Now that you mention that, i didnt even know there was a gsm bug. I am using
> asterisk 1.4.21.1, i visited the link you gave. I am guessing i will have to
> patch my asterisk installation, i am reading, the bug report to see,how i
> can verify that i have the gsm bug.

Well, if you have gcc version 4.2.x (you can check with "gcc -v")
there's a good chance this is the problem.


> If i do have the gsm bug,how can i fix
> it.

You won't need to patch asterisk.  The bug is actually in GCC.  You
have two options: 1) compile with GCC 4.1 instead of 4.2, or 2)
compile with the "DONT_OPTIMIZE" flag.

I'd probably pick option 1, but it may just be easier to use option 2
depending on what gcc packages are available for your system.


- Noah


> On Mon, Jul 14, 2008 at 11:40 AM, Noah Miller <noahisaacmiller at gmail.com>
> wrote:
>>
>> Hi Leotis -
>>
>> > When i run fxotune -i i get the following output:
>> >
>> > sudo fxotune -i
>> > Tuning module /dev/zap/1
>> > Done!
>> > /dev/zap/2 absent: No such device or address
>> > /dev/zap/3 absent: No such device or address
>> > /dev/zap/4 absent: No such device or address
>> > /dev/zap/5 absent: No such file or directory
>> > /dev/zap/6 absent: No such file or directory
>> > /dev/zap/7 absent: No such file or directory
>> > /dev/zap/8 absent: No such file or directory
>> > /dev/zap/9 absent: No such file or directory
>> > /dev/zap/10 absent: No such file or directory
>> > /dev/zap/11 absent: No such file or directory
>> >
>> > is this the expected output ?
>>
>> Yes, if you only have one Zap channel configured.
>>
>> If you specifically have problems playing back gsm files, make sure
>> you're not dealing with the gsm playback bug.  Basically, if you
>> compiled with the default options using GCC 4.2, gsm transcoding may
>> be distorted. See here:
>>
>> http://bugs.digium.com/view.php?id=11243
>>
>>
>> - Noah
>>
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>
>
>
> --
> Leotis Buchanan
> Manager/Electronic Design Systems Engineer
> Exterbox.com
> _______________________________________________
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