A technique for notifying a person who is engaged in a telephone call with a second person that a third person is calling him or her is disclosed. In particular, the illustrative embodiments wait for an “appropriate opportunity” to notify person 101-1 of the arrival of the incoming message from person...http://www.google.com/patents/US7046784?utm_source=gb-gplus-sharePatent US7046784 - Polite call waiting notification
