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

Wed Jul 23 10:07:43 EDT 2008

Inline.

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: Djokic Sinisa [mailto:sdjokic at mds.rs] 
Sent: Wednesday, July 23, 2008 9:54 AM
To: Chris Ward (chrward); 'Ed Leatherman'
Cc: 'cisco voip'
Subject: RE: [cisco-voip] echo in CUCM 6.1 !!!

hi chris..

answers..

- for now just 7911 and 7975 phones..

                CW -  so you have other models that are not experiencing
echo? If so, what models?

- calls out the GW - IP phone to IP phone calls are O.K..

                CW - Points to GW. Might need a PCM capture from the GW
to identify where the echo Is being introduced. (I don't know the
procedure, but the MS TAC team would know)

- caller on IP phone calling outside hears echo..called number - outside
in PSTN doesn't..

- they are using headsets when hearing echo, we tried with speakerphone
also, and collegue said that she thinks she can hear it also..

                CW - I have seen headsets cause echo in the past. If the
headset produces echo have the IP Phone users switch to the handset and
see if they still hear it. When using speakerphone, make sure the volume
is less than 75%.

we're not hearing it all time, but definetelly during a call..

and we're not hearing it in every call, just in certain ones..

ALL TROUBLED CALLS ( which we troubleshooted )are placed to:

1. BRI - but with analoug phone attached to NT

2. to E1 PRI with unknow PBX 

3. to E1 PRI with siemens PBX 

strange????????????????????????

echo or not, the simptom is caller can hear it's own voice in the
headset..

isn't it?..

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: Chris Ward (chrward) [mailto:chrward at cisco.com] 
Sent: Wednesday, July 23, 2008 3:42 PM
To: Djokic Sinisa; Ed Leatherman
Cc: cisco voip
Subject: RE: [cisco-voip] echo in CUCM 6.1 !!!

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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