Methods and systems are disclosed that allow for the exchange of voice mail messages between different VMSs of different service providers and/or in different networks by the transmission of such messages through a data network using a standard protocol of the data network. Methods and systems also are...http://www.google.es/patents/US6882708?utm_source=gb-gplus-sharePatente US6882708 - Region-wide messaging system and methods including validation of transactions
Region-wide messaging system and methods including validation of transactions
