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

[Djokic Sinisa]

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_note09186a0080
149a1f.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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