A plug in adapter is hardly going to break the bank of any installer and is the least work for them, and it removes the hassles when the customers buy a new phone etc because their old one looks stupid in the nice new kitchen etc.
Have you looked at Computer Dynamics ? http://www.cdlnz.com
Note that I am only a customer - I have no special relaitonship to or with them, but they do supply a lot of networking and telephone type stuff to those in the know.
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