I’m in the process of figuring out how to replace my house’s proprietary phone system with Asterisk. One component is a set of two intercom panels outside the house. They are simple single button panels that call into the phone system when pressed and setup a call when answered.
Does such a thing exist in the IP telephony world? I would love to find an interface device for these Panasonic panels but I assume they are proprietary and will need to be replaced.
This posting gives me some help: