This read-create object controls whether this CUG member can receive calls from and make calls to other members of the same Closed User Group: none(1) allows both incoming and outgoing calls within the CUG, while incoming(2) or outgoing(3) block calls in that specific direction. It directly enforces the access-restriction purpose of a CUG for this particular member. An admin setting up a CUG for a corporate customer that should only be able to call out to other sites, but never receive calls from them, would set this to incoming(2) to bar inbound CUG calls for that member.