[Asterisk-Users] Strange Quality problems with Asterisk, Gentoo, Redhat and Kernels - /dev/dsp

[Duane Cox]

negative on the /dev/dsp
not sure about zaptel timing, where do I check that?  I just compiled cvs 
and set some parameters in conf files...

Zaptel Configuration
======================

SPAN 1: ESF/B8ZS Build-out: 0 db (CSU)/0-133 feet (DSX-1)
SPAN 2: ESF/B8ZS Build-out: 0 db (CSU)/0-133 feet (DSX-1)

48 channels configured.


----- Original Message ----- 
From: "Deon Rodden" <drodden at webunited.net>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Wednesday, September 29, 2004 10:15 AM
Subject: Re: [Asterisk-Users] Strange Quality problems with Asterisk, 
Gentoo, Redhat and Kernels - /dev/dsp


> Does /dev/dsp exist for you? What are you using for zaptel timing?
>
> Duane Cox wrote:
>
>> For what it's worth, I'm using linux-2.4.27 kernel built with gcc-3.3.4
>> and glibc-2.3.3  and everything is completely fine...  totaly custom 
>> distro.
>>
>> Duane Cox
>>
>> ----- Original Message ----- From: "Deon Rodden" <drodden at webunited.net>
>> To: <asterisk-users at lists.digium.com>
>> Sent: Wednesday, September 29, 2004 9:56 AM
>> Subject: [Asterisk-Users] Strange Quality problems with Asterisk, Gentoo, 
>> Redhat and Kernels - /dev/dsp
>>
>>
>>> I've compiled Asterisk on Redhat 9 and Fedora Core 1 in the past, 
>>> generally without any problems. Especially w/ the stock kernel, which I 
>>> generally loathe. When I tried to upgrade my Redhat 9 Server to the 
>>> 2.4.27 kernel, doing a manual/clean compile, I had massive quality 
>>> issues. I was forced to go back down to a stock 2.4.24 kernel. Never 
>>> figured out why.
>>>
>>> Now, I've installed Gentoo and am using the 2.4.26 kernel, and things 
>>> initially appeared ok. I emerge'd Asterisk, the dependencies were 
>>> downloaded compiled, Asterisk 0.9.0 was compiled, I then used cvs to 
>>> update to the latest libpri/zaptel/asterisk. Everything seemed fine. 
>>> However, I'm noticing the occasional quality issue. First I just thought 
>>> the music on hold was a little choppy, but that always seems normal, I 
>>> blamed the zaprtc/rtcsetup thing I'm using to get zaptel timing.
>>>
>>> But then we noticed problems with Grandstream phones. The grandstream 
>>> would connect to the Gentoo Asterisk Server via SIP, then go out via IAX 
>>> across a T1 to the main asterisk server (Redhat 9), which then pushes 
>>> the call via SIP to a Cisco Router that's connected to several PRI's. My 
>>> last clue therem ay be a problem with Gentoo is the T1 card we put in 
>>> another server. We put a T100P in another Gentoo server, therefore 
>>> didn't need zaprtc/rtcsetup, and it uses pri-net to simulate a Voice T1 
>>> PRI for a PBX system. Calls will come in via IAX2, from my main asterisk 
>>> server, and it will then (using Zap) go out the T100P into the PBX. 
>>> There's an intermittant quality issue there as well.
>>>
>>> The only clues in the log files was something about /dev/dsp missing. 
>>> This didn't seem a big deal, music on hold worked, etc. but I noticed 
>>> that /dev/dsp existed on my redhat machines, even though they're the 
>>> same servers, no sound cards or anything. The kernel on the Redhat 
>>> machines was compiled with several sound card modules, but nothing 
>>> integrated. An 'lsmod' reveals a module called soundcore loaded, but I 
>>> can't find soundcore on my Gentoo machines.
>>>
>>> Is there anything mandator in the compilation of the kernel that will 
>>> affect Asterisk's quality? The CPU load on the systems is nothing. 
>>> Everything "appears" normal. The only common factor is custom compiled 
>>> kernel. A custom compiled 2.4.27 on Redhat had problems, and a Custom 
>>> Compiled 2.4.26-gentoo on Gentoo has not-so-apparent problems too.  I've 
>>> always been on top of the latest CVS updates on Zaptel/Asterisk/libPRI
>>> _______________________________________________
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>>
>> .
>>
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