[Asterisk-Users] Call quality questions

[Lane Hoskins]

Thanks...

	-----Original Message----- 
	From: mattf [mailto:mattf at vicimarketing.com] 
	Sent: Fri 1/30/2004 5:16 PM 
	To: 'asterisk-users at lists.digium.com' 
	Cc: 
	Subject: RE: [Asterisk-Users] Call quality questions
	
	

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

	

	Yes, we are using the SMP settings

	
	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.

	Have tried everything - alaw, ulaw, gsm - currently using gsm
	
	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.

	wish I'd known that before I recommended we buy 12 of them :-( :-)
	
	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.

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

	yes
	
	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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