부산대학교 도서관

A method to providing VoIP telephony to a plurality of users of a VoIP network includes authenticating and registering a primary user to a VoIP device to support call signaling associated with the primary user. A guest user subscriber of the VoIP network having a guest user directory number is authenticated in response to a password. The guest user directory number is mapped to the unique hardware identifier of the VoIP device, and a second set of VoIP parameters are downloaded from the VoIP network to the VoIP device in order to support call signaling associated with the guest user. VoIP calls are then within the VoIP network in response to the mappings of the primary user directory number and the guest user directory number to the same unique hardware identifier.