[Asterisk-Users] Very bad echo (appears that...)

[Asterisk PBX]

The echo canceller algorithms aren't doing anything.  We get extreme
echo during the conversation, it appears even before the call connects,
the echo is there...  

This only happens with SIP to/from WCFXO (analog POTS).  Looking at the
Zaptel configuration:

	/etc/asterisk/zapata.conf:
		echocancel=yes
		echocancelwhenbridged=yes
		rxgain=0.8
		txgain=0.8

(although none of the above options seem to make any difference).

Is there any debugging we can turn on to see what the problem may be,
this definitely will hurt production of this environment.

Thanks,
Lenny
---
Lenny Tropiano                          E-mail: lenny at voiping.com
Partner, Networking Specialist          Pager:  pager-lenny at voiping.com
VoIPing, LLC                            URL:    http://www.voiping.com/
PO Box 867, Cedar Park, TX 78630-0867   512-698-8647(V) 425-944-6391 (F)