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Home > Archive > Voice over IP Cisco > June 2005 > Voice quality issues with FXO ports
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Voice quality issues with FXO ports
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| Erick Bergquist 2005-05-28, 8:45 pm |
| 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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| |
| Mai Le 2005-06-01, 5:45 pm |
| 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@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] On Behalf Of Erick Bergquist
Sent: Saturday, May 28, 2005 6:19 PM
To: cisco-voip@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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________________________________________
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| |
| Erick Bergquist 2005-06-01, 5:45 pm |
|
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@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@puck.nether.net
> [mailto:cisco-voip-bounces@puck.nether.net] On
> Behalf Of Erick Bergquist
> Sent: Saturday, May 28, 2005 6:19 PM
> To: cisco-voip@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.
>
>
>
>
> __________________________________
> Yahoo! Mail
> Stay connected, organized, and protected. Take the
> tour:
> http://tour.mail.yahoo.com/mailtour.html
>
> ________________________________________
_______
> cisco-voip mailing list
> cisco-voip@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
> CONFIDENTIALITY NOTICE: The information contained in
> this message and
> or attachments is intended only for the person or
> entity to which it is
> addressed and may contain confidential and/or
> privileged material. Any
> review, retransmission, dissemination, copying, or
> other use of this
> information by persons or entities other than the
> intended recipient is
> prohibited. If you received this e-mail or its
> attachments in error,
> please contact the sender and delete the material
> from any system and
> destroy any copies.
>
>
__________________________________
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