A calling party dials a called party, leaves a message on a voice messaging system after either receiving a busy status or a no-answer status, and the messaging system dials the called party at intervals until receiving an answer status and then plays the message. Prompts for delivery options and message...http://www.google.de/patents/US6711240?utm_source=gb-gplus-sharePatent US6711240 - Systems and methods for per use message delivery
