asterisk users - Oct 2004 - Asterisk, Zaptel and Legacy Phones?

Hi all,

Has anyone had any experience getting asterisk to work with legacy phones? 
I have been trying to get some of our exisiting Plessey PKS2 (Masterline) 
Keystation phones to work with asterisk. They are 4 wire extensions (2 for 
voice and 2 for data) I have connected a test phone to the asterisk server 
via a digium 400tdm and it kinda works in that if I lift the receiver I 
hear dialtone and if I call that extension, although the phone does not 
ring, it does answer when I lift the receiver and can have a conversation 
with the person the other end.

The problem seems to be that any of the phones functions/keys including 
the dialpad (I cannot use it to dial) do not work. Have I got any chance 
of getting these to work?

Maybe I am just better off throwing them away and re-cabling the building 
for SIP phones?

Thanks,

Sam
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