Hello Steven,
 SJ>> a) ZyXEL wont implement V.34+ in their ISDN-TA's
 SL> only internal zyxelmodems support v34+
Let me say it clearer: ZyXEL has build some analogus modems (Series U-336) 
which are capable of V.34+, but all other one, especially the Combi-ISDN-TA, 
which was the main subject in this discussion here, won't better can't 
support V.34+, for more information about that ask Manfred Recla, European 
Support Coordinator of ZyXEL: m.recla@zyxel.co.at
Bye
Stefan
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