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

[Jonathan Charles]

E1s are digital (just like T1s...)

Hence, there is no '4-wire to 2-wire conversion in the hybrid
transformer'... so, no echo.

The echo must be coming from outside of the system.



Jonathan

On Wed, Jul 23, 2008 at 8:31 AM, Djokic Sinisa <sdjokic at mds.rs> wrote:
> 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_note09186a0080149a1f.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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> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
> --
> Ed Leatherman
> Senior Voice Engineer
> West Virginia University
> Telecommunications and Network Operations
>
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>
>