asterisk users - Dec 2005 - Call Monitoring / Ext to Ext with Sipura-841

Hi All,

I am using Asterisk 1.2 with 10 Sipura-841 phones.

Outgoing and incoming calls sound great. However, extension to
extension calls are really loud with a lot of background noise picked
up.  Also, the same issue exists when using 888 to barge in and monitor
calls.

I've been through the configuration for the 841s but I can't seem to
find
a setting that addresses the problem.

Is anyone else experiencing this and if so do you have any pointers on
what I might try to correct?

TIA,

Mike