Rhino Channelbank…

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I am having a problem with a Rhino channelbank. I have an Asterisk
server running 1.6.2.9 and DAHDI 2.4.0 on a CentOS 5.5 system. We have
a TE420 card with the first port used in E1 mode (R2, 20 channels) and
the fourth is in T1 mode for the channelbank. We are using MG2 echo
cancellation.

The Rhino unit has 12 FXO ports. Five are GSM adapters and another
five are regular phone lines. We are having problems with the GSM lines
at the moment. When we enable MG2 on those lines we get dropped calls
or noise or the call cannot go through. If I disable eco cancellation
it mostly works (one port still drops the call almost immediately) but
there is echo.

Here is the DAHDI configuration:

# Span 4: TE4/0/4 “T4XXP (PCI) Card 0 Span 4” B8ZS/ESF
span=2,2,0,esf,b8zs
# termtype: te
fxsks=94-105
#echocanceller=mg2,94-105

Here is chan_dahdi.conf
; Span 4: TE4/0/4 “T4XXP (PCI) Card 0 Span 4” B8ZS/ESF
group=4
context=from-pstn
signalling = fxs_ks
accountcode=Celulares
faxdetect=no
echocancel=no
echocancelwhenbridged=no
echotraining=no
channel => 94-97,104-105

Does anyone have any suggestions on how to enable echo cancellation on
the Rhino Channelbank?