Weird Echo Problem

General Help
1

Hello,

I’m not sure at the moment if I should have posted this on Cisco’s site or here, but i figured I would try here.

I was going to use the a new SPA112 to hook it up to our alarm panel, but after I got it connected to our asterisk server I noticed something very strange. The when you place a call with the SPA112 there is always a echo on the other end of the line. Whether or not it’s to a another extension or to a outside line.

No other extensions (Polycom phones and a SPA2102-NA) have this problem. At the moment I’m at a loss on how to fix it or even being to trouble shoot it.

2

Try adjusting the levels. It’s an analog device. Any impedance mismatch will cause echo.

3

Would that also apply when it just the other end that hears the echo (their self and you) and you hear no echo?

4

A word of caution here:

I assume you’re trying to have your alarm call out through your PBX. In many areas, this may violate code, and in any case it is not a good practice to run an alarm behind any type of PBX.

BF

5