You should be able to do this by enabling intercom, then setting private dial plan to yes (if it s not already set), set the number of digits that a private number will be (like 4 digits), then assign a 4 digit private LDN to each port. This requires you to create a separate phone trunk group for each port, separate private ldn table for each and make the assignment.
If you also want to be able to dial public numbers, you will need to use the intercom prefixes (multipath prefix, pstn prefix, IP prefix, etc), but you should be able to find some info on this in the help file.
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