I have a requirement to create share a 3cx pro between two groups of users (Group A on extensions 4xxx and Group B on extensions 5xxx). Each group will have their own SIP trunk which the other group will not be allowed to use. The main issue is that these two groups must not be able to see or interact with each other, from their perspective they are the only users on the system. I've tried to setup these two groups but I am still seeing extns from the other group for example in the contact list. Is there a way to setup something like this? Any assistance gratefully received.