| RE: Analog adaptor
As long as the infrastructure is in place you should be ok. Especially with a mature product.
I wouldn't hesitate unless your network isn't up to par. You may hire someone to do a VOIP Network assesment before you do. I would highly recommend it with that many phones. Also it may be helpful to engineer the network to seperate voice and data traffic via Vlans.
But to answer your question. With today's IP telephony I don't think I would be concerned with using all IP phones |