An alphanumeric messaging system for exchanging alphanumeric messages over a communications connection. The alphanumeric messaging system comprises a communications circuitry, an alphanumeric telephone, and a switching system. The communications circuitry is configured to originate a communications connection...http://www.google.co.uk/patents/US6553106?utm_source=gb-gplus-sharePatent US6553106 - Alphanumeric messaging system
