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I have a lobby phone (common area) that i dont want customers to be able to make external calls with. Is there a way to restrict a phone from making calls to external numbers? I have tried the block external numbers but that only seems to work for inbound calls from external numbers.
Only way to do so is by controlling the dial plan of your phone. I was able to do it with Yealink phones controlling both onhook and offhook dialing - but the dialplan on polycom phones was limited in ability and could not block onhook dialing with our old Polycom phones - newer ones might have this though.
It has been there since I've been using the system (since last Fall), at least. We make use of unchecking the Incoming Calls for our DIDs because the only calls that they receive are wrong numbers or spam, and we only publish our one main incoming line.