I've been working on this this morning and I can't see a way how to do this.
All digit manipulation and barring is designed for external calls so you can do virtually anything you want with the number after you have dialled the outgoing code.
200ICP actually has a COS option to block extension to extension calling because of hosptality ....But the 5600 is i think based on 3300 call control and the only way I would know how would be to put each extension in as a different tenant...then block tenant calling...it would be a nightmare so I don't think it would be practical.
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