[Asterisk-Users] Call quality questions

[mattf]

Hello,

Did you set the flag in the makefile for zaptel for SMP kernels?

1. I have a couple Snom200 phones on my system running redhat with a P4 HT
and haven't had any issues with horrible sound quality using 711ulaw.

2. As for the speakerphone cutout, that's to be expected, The snom200s are
just half-duplex speakerphones. If you want a good speakerphone get a
Polycom.

3. If you have silence suppression turned on anywhere I would turn it off.
We had the same problem with our Sipura adapters until we turned off the
silence supression. You could also mess with the level of echo supression
and see if that makes a difference.

4. do you have your T1 set in zaptel.conf to be the primary timing source
for your card? 

Hope that helps,

MATT---


-----Original Message-----
From: Lane Hoskins [mailto:lane at automatedhorizons.net]
Sent: Friday, January 30, 2004 4:22 PM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] Call quality questions


Our basic system is as follows:

P4 3.0 Ghz w/ HT, 1GB PC3200 RAM, 120 GB HDD, RH 9.0 OS, * from CVS
several weeks ago, working OK for routing, VM, and AA, calls in on
separate PSTN lines to Adtran TSU 600, into * server through T100P card.
The hardware is not taxed at all with little over 20% proc utilization
ever, low mem use, etc. All Phones are SNOM 200's with various firmware
revisions from 2.2t to 2.3o.

Any help is appreciated.

1. We have horrible sound quality regardless of the codec we use in the
phone or specify in *. Has anyone else run into this early on and found
a software fix?

2. Speakerphone will not work for playing VM messages, it chops the
message into unintelligible fragments of audio. Any ideas? 

3. Initially we have horrible introduction of background noise into the
handset earpiece which seems to quiet after there is audio on the other
end. Ideas?

4. Sound quality to called parties outside our system is intermittently
horrible: static filled and raspy where we have to ask people to repeat
themselves many times. Could this be related to powerline noise or
something like that?



Lane Hoskins, MCP
Network Engineer
Automated Horizons Inc.
Direct - 540.767.7626
Main - 540.767.7600


 
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