x port is used when you don't have a physical port to assigned to the extension. Uses include pre-programming phones, and place holders. You could also use the extension for other purposes utilizing its coverage path. You would also use it when initially setting up IP stations. I've used them as secondary extensions... basically two extensions on 1 phone via call appearance bridging. The second extension is x ported as it does not have a physical port.
X ported stations do count toward your total station RTU's. So in effect they cost money.
As far as limitations... It does count to your station RTU's (right to use). Not really.... but I suppose it depends on what you plan to do with them. Another example of usage is... It is a good way of having a "dummy" station setup... stattion type, button mapping, COR, COS etc... So you can duplicate the "dummy" extension. Sure you could do this off somebodies extension... however has it been changed or not since it was first setup etc...
If you are not planning to have an endpoint, the virtual extension may be the way to go. You can still use coverage path with them, and they do not affect RTU.
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