[cisco-voip] echo in CUCM 6.1 !!!

Wed Jul 23 09:41:57 EDT 2008

Got a couple questions:

-You mentioned the problem was on 7975 and 7911 phones, does this imply
that you have a 7961 or some other model that doesn't experience this?

-Also, Is the echo heard only on calls out the GW? Are IP phone to IP
Phone calls ok?

-Who hears the echo? Both sides of the call or only one side? (If only
one side, which side)

-Are the callers hearing echo using headsets or speaker phone with the
volume turn up? If they switch to handsets does the problem go away?

Echo is an analog problem, so we should try and focus on the analog
elements. This means the DSPs in the Phones (resolved by firmware
upgrades), DSPs in the GW (IOS upgrades), or potentially a Telco issue.

Chris Ward 

Cisco Systems Inc. 

Customer Support Engineer

Unified Communication Infrastructure

Boxborough, MA 

9:00am - 6:00pm Eastern 

978-936-0217

chrward at cisco.com

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Djokic Sinisa
Sent: Wednesday, July 23, 2008 9:32 AM
To: 'Ed Leatherman'
Cc: 'cisco voip'
Subject: Re: [cisco-voip] echo in CUCM 6.1 !!!

yup..

i've read all about it..

but we cannot make the situation any better..

we played with the config on VG, and upgraded IOS on it..

but no help..

i mentioned CUCM and phones just to provide whole scenario..

although, maybe firmware in phones can have something to do with it,
even i don't think it should..

and, we tested by placing calls to that " trouble outside numbers " from
another CUCM system, from another PRI, and no echo is heard..

so, it can only be problem on system in place, or maybe TELCO PRI..

thanx..

regards..

Sinisa Djokic 

System Engineer
CCNP,CCDA,CQS-CWLDS,CS-CIPTDS,CS-CIPCCES Cisco Certified

MDS Informaticki inzenjering
Bul. Arsenija Carnojevica 170
11070 Novi Beograd, Serbia
Tel: +381 11 2015 200, 2015 273
Fax: +381 11 3194 954
www.mds.rs
sdjokic at mds.rs

________________________________

From: Ed Leatherman [mailto:ealeatherman at gmail.com] 
Sent: Wednesday, July 23, 2008 2:51 PM
To: Djokic Sinisa
Cc: cisco voip
Subject: Re: [cisco-voip] echo in CUCM 6.1 !!!

Sinisa,

Have you seen the troubleshooting guides on cisco.com regarding echo? 
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a
0080149a1f.shtml

The echo is probably less to do with your CUCM and IP Phones and more to
do with the gateway and the outside telephone systems your people are
calling.

Ed

On Wed, Jul 23, 2008 at 8:19 AM, Djokic Sinisa <sdjokic at mds.rs> wrote:

hi guys..

did anybody had issues with echo in system with CUCM 6.1.2 and 2821 with
12.4 code ( varios version - 12.4.9T6, 12.4.15T etc. ), vwic-1mft-t1/e1
card and PVDM2-48..

the echo can be heard when call is placed to certain phone numbers, and
it is noticed on 7975 and 7911 phones - the only phone types in system..

we changed everything we could in VG config, from echo cancel coverage,
IOS image to attenuation..and nothing helped..

any ideas..

thanx..

regards..

Sinisa Djokic 

System Engineer
CCNP,CCDA,CQS-CWLDS,CS-CIPTDS,CS-CIPCCES Cisco Certified

MDS Informaticki inzenjering
Bul. Arsenija Carnojevica 170
11070 Novi Beograd, Serbia
Tel: +381 11 2015 200, 2015 273
Fax: +381 11 3194 954
www.mds.rs
sdjokic at mds.rs

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-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University
Telecommunications and Network Operations 

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