US Patent 7447739 Data and voice messaging system

A messaging system is disclosed that includes an Internet Protocol switching network, an Internet access subsystem coupled to the Internet Protocol switching network via a first communication link, a voice access subsystem coupled to the Internet Protocol switching network via a second communication link, a mail subsystem coupled to the Internet Protocol switching network via a third communication link, and a storage subsystem coupled to the Internet Protocol switching network. The first and second communication links transfer data according to different data protocol formats.