caltexflanc
Guru
Our boat came with a nice Charles C Phone intercom and we used it a lot. However the interface to a cell phone was clunky and got clunkier as I messed with it. We transitioned to a Panasonic cordless phone system which worked out great. Two cell phones can pair to it on their own "channels" (so you can use either or see which one is ringing). Leave the cell phones nice and safe next to the base station. Each station can be custom labeled and the intercom function is simple and slick. Speaker phone function at each handset. This way you can reach people at a variety of different stations on the boat, and the handsets being cordless is great for trips to the engine room, utility/generator room, etc. A four station system was under a hundred bucks at Costco and easy to expand from there. When we moved back on land full time this was one of the first things I bought for the new house. Great piece of gear and so much more useful than any other solution. Here is an example of the one we got, and a list of the others.
http://www.costco.com/Panasonic-DEC...gital-Answering-System.product.100115378.html
Panasonic Bluetooth Powered Link-to-Cell
http://www.costco.com/Panasonic-DEC...gital-Answering-System.product.100115378.html
Panasonic Bluetooth Powered Link-to-Cell