A communication system formed by a private network that includes a private wireless network. The communication system includes a public wireless network using a public wireless protocol, such as GSM, and includes public networks, such as PSTN, ISDN and the Internet, using a wired protocol, such as IP....http://www.google.com/patents/US6539237?utm_source=gb-gplus-sharePatent US6539237 - Method and apparatus for integrated wireless communications in private and public network environments
