have you looked at mobitix?  
http://www.mobotix.com/eng_US/content/view/full/66936

they are expensive but work well.

>>> "Morgan, Michael" <[email protected]> 10/22/10 3:43 PM >>>
Can anyone recommend a Door Phone or Entry Phone that is SIP and compatible 
with 4.2.1.  This would be a press a button to communicate with a speaker 
phone.  Oh yes, it needs to be low cost.  I found some but they were ~$300.

-Michael Morgan

</[email protected]>
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