asterisk users - Aug 2003 - Echo cancellation problem from SIP to PSTN

Hello,

I have strong unsolved problem with echo while using asterisk as a SIP 
to PSTN gateway. The PSTN side is built with an OpenLine 4 from 
Voicetronix and the SIP is from GrandStream.

The echo I here is at the SIP side but not at the PSTN side. I have 
played with OL4 API to try to tune the echo canceller with no success. 
As there is not echo canceller a the SIP side I would like to seen your 
comments about inserting some echo cancel code (from zaptel driver for 
instance) in the voice path of this configuration.

Best regards,

Daniel

-- 
Daniel ANDRE (mailto:dandre@iris-tech.fr)
IRIS Technologies - http://www.iris-tech.com
Serveur kwartz - http://www.kwartz.com