Need a phone with LOUD speakerphone for schools

A couple of years ago I put Sangoma S305 phones in all the classrooms at a school. They are crazy loud for paging and intercom and work great because of that. But those phones have been discontinued. I’ve tried at least 6 other models of phones including the Digium P310 and P320 but the S305’s are about twice as loud as anything else I’ve tested.


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