TECHNIQUE FOR IMPLEMENTING ADVANCED VOICE SERVICES USING AN UNSTRUCTURED SUPPLEMENTARY SERVICE DATA (USSD) INTERFACE

摘要

A system for providing advanced voice services (AVS) on legacy handsets includes a Real-Time Exchange (RTX) that interfaces to a wireless communications network to provide the AVS therein, wherein the AVS comprise Push-to-Talk, Conference Call, and Instant Voice Messaging. Both the RTX and the legacy handsets that use the AVS communicate with each other using an Unstructured Supplementary Service Data (USSD) session to provide the AVS on the handsets, wherein the USSD sessions are interactive, menu-driven sessions. The USSD sessions allow users of the legacy handsets to perform a number of AVS functions, including Group Management Services, Call Management Services, and Presence Management Services.