[Asterisk-Users] Grandstream GXP-2000

[Peter Svensson]

On Fri, 28 Oct 2005, Erick Baum wrote:

> We have 50 of these phones in one location and a couple remote phones. The
> problem seems to be caused by the volume settings on the phone. We have
> noticed that the echo seems to be worse when the volume is very high on the
> phone (not using speakerphone). We're still testing, but that's what we've
> been able to come up with so far.

Which end experience the echo? The phone with the loud volume, or the 
other end? If it is the remote end that experience echo then I would 
suspect acoustic coupling from the earpiece to the microphone inside the 
handset.

If this is the case there are a few solutions:
  - lower the volume (duh!)
  - try connecting another handset with a known good decoupling of the
    mic/speaker
  - get grandstream to use the software echo canceller when using the
    handset as well as when on the speaker phone.

Peter