[asterisk-users] Asterisk, POTS and plain handsets

[Steve]

Hello,

I've spent a couple days searching and posted into the forum with no luck, apologies 
to anyone who reads the Digium forums for the cross-post.

I'm having a problem with an asterisk set up where I have a TDM402B connected to a POTS 
line.  Also connected to the POTS line are plain telephones, non SIP, just plain 
old telephones.  When one of the normal handsets goes off-hook, asterisk 
reads it as an incoming call and starts handling it accordingly, running through the 
context for that channel as if an incoming call was detected.  I'd like asterisk to act 
like just another handset on the line or an answering machine and not do anything if a handset is used 
on that same line.

It seems like maybe it's a voltage issue where asterisk or the zaptel module is sensing a 
voltage change on the line and so is doing what it thinks it should do.  I'd like to know 
how to dumb it down or make it less sensitive to the changes, if indeed that is the cause.

I've tried various combinations of asterisk versions and zap module versions and various combinations of 
phone lines to the card and, well, everything else that I can think of.  So I'm hoping that 
someone out there has used an asterisk set up like this and maybe encountered the same 
things that I'm seeing.

I'd be happy to post any configs that someone might find relevant.

Steve