[asterisk-dev] Differences between wctdm and wctdm24xxp

[Steve Suehring]

Hello,

I recently replaced a TDM22B with a TDM402B and I'm having problems getting the TDM402B 
working like the TDM22B used to.  I believe there to be a problem with the driver for 
the wctdm24xxp, or there was a legacy problem (feature) with the wctdm and the old card 
that was fixed.

As someone who has submitted a small feature patch for the 1.6 code I'm not afraid to 
spend some time hacking the module code either, if necessary.  I'm hoping someone can 
lend a hand and point me in the right direction in the wctdm24xxp code on the zap 1.4.11 
base.

The set up that I have consists of a POTS line connected one of the FXO ports the 
TDM402B, two SIP phones, and three regular handsets.  Both the asterisk server and the 
three handsets all home-run to the telco drop.  When one of the plain, non-SIP handsets 
is taken off-hook, the asterisk server is reading that as being an event and fires off 
Simple Switch on the FXO port which puts it into the correct context for an incoming 
call.  Problem is, there's no incoming call, just someone picking up the phone in order 
to dial out from one of the plain handsets.

In the previous incarnation with the TDM22B, this worked fine.  If I power down, take 
the TDM402 out and replace it with the TDM22B it works fine.  Removing the TDM22B and 
replacing it in the same PCI slot with the new TDM402B, it breaks.  I even went so far 
as to remove an FXO module from the new card and put it into one of the slots on the old 
TDM22B card, with no luck, which is to say that even with the *new* FXO module in the 
old card, it still works as I'd like it to work.

So that leaves me with two apparent differences, the PCI card itself, which does have a 
different layout than the old TDM22B, or a bug in the wctdm24xxp module.  Alternately, 
this could have been a bug in the wctdm code or old card that's now been fixed.  
However, for my purposes it's a bug now.  :)

Can someone point me in the direction of the code in the wctdm24xxp that causes it to 
detect off-hook or voltage changes where it would think that it's getting an incoming 
call?  I spent some time searching around in there but haven't had much success yet.  
And I won't ask how wctdm and wctdm24xxp differ because they look fairly different, with 
one being 2559 lines and the other 4063.

Thanks for any help anyone can provide.

Steve Suehring

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