Mailing List Archive: Cisco: VOIP

Testing a new PRI for echo before deploying it...

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treimers at ashevillenc

Mar 15, 2012, 8:37 AM

Post #1 of 2 (251 views)
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Testing a new PRI for echo before deploying it...

Hi everyone -

I have a quandary..

I've got several PRIs here at my workplace, and they are used for
inbound/outbound calling, and one PRI is used for just inbound calls to
a call center.

I've added a new PRI in a trunk group (from AT&T) with that PRI for the
customer call center.

We have outboard echo cancellers in line between AT&T and the routers on
our existing four PRIs, however, I don't have an echo canceller for this
new PRI

*yet*

I've heard it said that we had these echo cancellers installed (before I
was here) because the original routers/IOS versions didn't support
sufficient echo cancelling, so outboard cancellers were needed, and that
the current hardware/IOS may support enough echo cancellation onboard to
solve any problems.

I'd like to do two things:

1. Verify that I actually -can- do echo cancellation with this
hardware/IOS and how many ms of echo cancellation it can do.

2. I'd also like to put this PRI in test mode some way so that it
is available for making selected calls (like set it up so that all my
calls go through it), and run it for a few days to ensure that I've got
the echo cancellation configured right, or know that I have to buy an
external echo canceller.

What advice do you folks have for these two questions?

This is a sh ver from that router. It has two other PRIs in it, which do
go through the external echo canceller.

System image file is "flash:c2800nm-spservicesk9-mz.123-11.T8.bin"

Cisco 2821 (revision 53.51) with 249856K/12288K bytes of memory.

Processor board ID FHK0848F28R

2 Gigabit Ethernet interfaces

72 Serial interfaces

3 Channelized T1/PRI ports

6 Voice FXO interfaces

DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

62592K bytes of ATA CompactFlash (Read/Write)

Dennis.Heim at cdw

Mar 15, 2012, 8:42 AM

Post #2 of 2 (234 views)
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Re: Testing a new PRI for echo before deploying it... [In reply to]

You are on some pretty old code. I would look at doing the necessary upgrades to get to 12.4.24T/15 or replacing to with an ISR-G2.

Dennis Heim
Senior Engineer (Unified Communications)
CDW Advanced Technology Services
10610 9th Place
Bellevue, WA 98004

425.310.5299 Single Number Reach (WA)
317.569.4255 Single Number Reach (IN)
317.569.4201 Fax
dennis.heim [at] cdw<mailto:dennis.heim [at] cdw>
cdw.com/content/solutions/unified-communications/<http://www.cdw.com/content/solutions/unified-communications/>

From: cisco-voip-bounces [at] puck [mailto:cisco-voip-bounces [at] puck] On Behalf Of Tim Reimers
Sent: Thursday, March 15, 2012 8:38 AM
To: cisco-voip [at] puck
Subject: [cisco-voip] Testing a new PRI for echo before deploying it...

Hi everyone -

I have a quandary..

I've got several PRIs here at my workplace, and they are used for inbound/outbound calling, and one PRI is used for just inbound calls to a call center.
I've added a new PRI in a trunk group (from AT&T) with that PRI for the customer call center.

We have outboard echo cancellers in line between AT&T and the routers on our existing four PRIs, however, I don't have an echo canceller for this new PRI
*yet*

I've heard it said that we had these echo cancellers installed (before I was here) because the original routers/IOS versions didn't support sufficient echo cancelling, so outboard cancellers were needed, and that the current hardware/IOS may support enough echo cancellation onboard to solve any problems.

I'd like to do two things:

1. Verify that I actually -can- do echo cancellation with this hardware/IOS and how many ms of echo cancellation it can do.

2. I'd also like to put this PRI in test mode some way so that it is available for making selected calls (like set it up so that all my calls go through it), and run it for a few days to ensure that I've got the echo cancellation configured right, or know that I have to buy an external echo canceller.

What advice do you folks have for these two questions?

This is a sh ver from that router. It has two other PRIs in it, which do go through the external echo canceller.

System image file is "flash:c2800nm-spservicesk9-mz.123-11.T8.bin"
Cisco 2821 (revision 53.51) with 249856K/12288K bytes of memory.
Processor board ID FHK0848F28R
2 Gigabit Ethernet interfaces
72 Serial interfaces
3 Channelized T1/PRI ports
6 Voice FXO interfaces
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62592K bytes of ATA CompactFlash (Read/Write)

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