[Asterisk-Users] x100p bridged - detect voice?

[Rich Adamson]

I'm running * on two pstn lines (x100p cards) that happen to also have 
analog phones installed on the incoming pair for backup (until testing is 
complete).

If someone is talking on a pstn analog phone and they talk loud
enough, * senses the voice (apparently assuming the line is ringing),
and rings an appropriate SIP phone (7960). Is there a way to config
* so as to only process inbound "ringing" (and ignore voice)?

My zapata.conf entry for the inbound FX line looks like:
context=inbound-home
switchtype=national
signalling=fxs_ks
usecallerid=yes
hidecallerid=no
callwaiting=yes
callwaitingcallerid=yes
threewaycalling=no
echocancel=yes
echocancelwhenbridged=yes
rxgain=0.0
txgain=0.0
immediate=no
callprogress=no
musiconhold=default
channel => 1   

Suggestions?

Rich