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

[Brian West]

Do not use portage for zaptel, asterisk or libpri.  That's the bottom line.
Also do not use portage for mpg123.

bkw

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Deon Rodden
> Sent: Wednesday, September 29, 2004 9:56 AM
> To: asterisk-users at lists.digium.com
> 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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