Systems for Telephony Display Management, Location Services, and Voice Call Network Switching (DEAL 464)

This lot contains patents related to telecommunication system for automatically refreshing a display screen of a telephone, caller location determination system, audio announcement delivery system and techniques to switch a voice call from an Instant Messaging (IM) based voice network to a cellular voice network. Disclosed is a technique to refresh a telephone display which is based upon on a display panel based on a function change such as displaying on a telephone display a first screen based on a function and selecting a function based on information. Another set of patents in the lot disclose a technique for switching a voice call from an IM voice network to a cellular voice network using a service gateway associated with the IM-based and cellular voice networks. The technology may be implemented in telephone call management system, emergency services system, location based services, emergency caller location determination system, automatic messaging system, information broadcasting system, etc.