Embodiments of the present invention include methods of distributing telephone identity associations among multiple telephone systems in a telephone network. In one embodiment, the present invention includes methods of distributing, receiving, redistributing and withdrawing telephone identity association...http://www.google.com.hk/patents/US7613451?utm_source=gb-gplus-share專利 US7613451 - Telephone identity association and a method of distributing telephone identity association to telephone systems
