Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


Cisco T1 hwic echo

Posted on 2013-11-21
Medium Priority
Last Modified: 2013-12-16
We use IP phones and we connect directly to our other office using a T1 line on a cisco 1941 router.  On the one side the sound quality is perfect.  On the other side the sound has a echo.  Is there commands that I can do to eliminate.  

this is what I have
interface Serial0/0/0
ip address
service-module t1 clock source internal
service-module t1 timeslots 1-24

I am using a cisco 1941 with a hwic dsu/csu inteface card.
Question by:bidgadget
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 34

Expert Comment

by:Istvan Kalmar
ID: 39666709

1941 isn't voive router so you need to find the problem on the callmaNAGER
LVL 10

Accepted Solution

koudry earned 2000 total points
ID: 39684339
I know that, unlike the Cisco 2900 platform, the Cisco 1941 cannot be used as a Local Gateway Service (LGS) for a Hosted Voice Service (HVS).  However, I think you should be able to use it to support voice.  

A Cisco HWIC-1T module supports up to 2M rate. The question is that, are you using this circuit for both voice and data? if the answer is yes, have you separated your voice traffic from your data traffic or do you let the two compete for bandwidth?

Voice has to be protected and there are two ways you can do this. On your LAN, you can have a dedicated VoIP subnet. You can then design QoS to protect that subnet in the event of congestion.   You need to do more tests to find out why voice works on one side but not the other.

Featured Post

Supports up to 4K resolution!

The VS192 2-Port 4K DisplayPort Splitter is perfect for anyone who needs to send one source of DisplayPort high definition video to two or four DisplayPort displays. The VS192 can split and also expand DisplayPort audio/video signal on two or four DisplayPort monitors.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

There are two basic ways to configure a static route for Cisco IOS devices. I've written this article to highlight a case study comparing the configuration of a static route using the next-hop IP and the configuration of a static route using an outg…
In the world of WAN, QoS is a pretty important topic for most, if not all, networks. Some WAN technologies have QoS mechanisms built in, but others, such as some L2 WAN's, don't have QoS control in the provider cloud.
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

722 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question