A method of providing a mixed group communication session for a mixed group containing protected users and a guest user is provided. The method uses a secure server to assign temporary Identities (IDs) to the protected users. The secure server forms a mixed group session containing desired participants from among the protected users and the guest user. The secure server provides limited group rights to the guest user in the mixed group session. During the mixed group session, the secure server uses the permanent IDs of the protected users towards other protected users and temporary IDs of the permanent users towards the guest user. Also provided is a method for providing a mixed group communication session for a mixed group containing protected users and a guest user, wherein temporary IDs are assigned to protected users and the guest user.