[cisco-voip] Where's the echo?

[Wes Sisk]

most likely at the remote site... and most likely in those analog lines.

http://www.cisco.com/en/US/customer/tech/tk652/tk701/technologies_white_pape
r09186a00800d6b68.shtml

look for impedance mismatch.  can try tuning voice port echo settings, if
it's impedance mismatch, echo is created at electrical interface and nothing
the DSP's can do about that.  most platforms allow impedance tuning

http://www.cisco.com/en/US/customer/tech/tk652/tk701/technologies_tech_note0
9186a0080477a06.shtml


/Wes

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net]On Behalf Of Voll, Scott
Sent: Wednesday, August 17, 2005 1:23 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Where's the echo?


I have this setup

PSTN - (VGW ---central site- CM) ----- T1 ---(remote location) - VGW ---
PSTN

If I call out the PSTN from the central site to the remote location via the
PSTN, I at the central location here echo.  Where's the echo problem?
Central site?

This is a new remote location.

Thanks

Scott

PS.  Central site has PRI's w/ 128ms echo cancellation and the remote site
has FXO ports with 64ms echo cancellation.  All is running MGCP and CM
4.1.3sr1