I need to find a door phone that will work on an analog port of an IP Office. Just to make it more difficult, it has to fit the door mullion.
Any suggestions are appreciated. I have already called Viking & Aiphone.

Thanks in advance.

what size is opening.
I always use C2000b, just in case they add a contact closure to the scenario.

But if you just want speakers, a list of analog ones is under the c2000b listed here. https://www.vikingelectronics.com/products/view_product.php?pid=503