[cisco-voip] Voice quality issues with FXO ports

[Erick Bergquist]

We ended up going to 12.4(1) which has a new featurwe,
THL tone sweep which runs several tones on the line at
different impedance levels and tells you the best
match impedance for the line to use.

That resulted in the best match being impedance 5 for
us which seems to be better so far but to early to say
for sure.

--- Mai Le <mle at Niku.com> wrote:

> Hi there,
> 
> We are experiencing the similar issue.  What
> firmware is running on your
> gateway ?  A cisco rep suggested that we upgrade our
> firmware to fix
> this issue.
> 
> Mai Le 
> 
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On
> Behalf Of Erick Bergquist
> Sent: Saturday, May 28, 2005 6:19 PM
> To: cisco-voip at puck.nether.net
> Subject: [cisco-voip] Voice quality issues with FXO
> ports
> 
> Hi,
> 
> Having some issues with a 2800 ISR and 6 analog
> lines and FXO
> interfaces. VIC2-4FXO and VIC2-2FXO. 
> 
> We had same problem with 2610XM router but upgraded
> to 2800 series for
> other reasons (performance, CPU, etc) and problem
> continues.
> 
> The voice quality issue is every now and then, on
> calls we will hear a
> few seconds of static, or a whishing type sound in
> background. Sometimes
> the users hear other noises like someone elses phone
> conversation in
> background. Sometimes there is a high pitched
> sqweaching sound briefly
> on calls. Sometimes the call is mushy and like
> you're talking through a
> wet rag. That is how one user describes the calls.
> 
> Both parties hear the whishing sound, high
> sqweaching, sometimes there
> is dropped syllables. 
> 
> The calls are local to same subnet as Gateway and
> G711. No errors on
> LAN, QoS is fine, etc. The users don't have problems
> with calls over WAN
> back to HQ, etc - just with calls on the local lines
> using FXO ports.
> 
> We have adjusted input/output gains every which way
> and the volume is
> good, etc with input gain 8 and output attenuation
> of -3. 
> 
> The above voice quality issues are off and on , some
> days there are no
> reports of issues and other days there is a lot of
> reports of above.
> There is no echo reported, etc and we have adjusted
> impediences also
> with no real change. Were told the local provider
> Sprint is supplying
> 900ohm lines and have matched that.
> 
> The problem appears to be calls made locally or
> within the same part of
> the state. This is in eastern NC (Kinston). Calls
> made to the phone
> lines from other states (LD Calls) appear to fine
> and problem free as
> this is how I am working and testing this and every
> time I call into all
> these lines I am not experiencing any of the above
> problems. 
> 
> These phone lines have been used with a old PBX
> system fine and if we
> plug up regular phones to the lines without going
> through the routers
> the calls are fine of the few dozen we made that
> way. 
> 
> I'm looking to see if anyone has had this sort of
> issue and has any
> ideas on how to fix it. We've replaced the FXO
> modules also. We have
> other sites in area with same hardware setup and
> same VICs and no
> problems like this at those sites. Just this one
> site.
> The local cabling has been checked and redone as
> well at the facility to
> rule out any problems. We are using
> 2 wire cables. 
> 
> 
> 
> 		
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