Two advanced group-based voice services, known as Push-to-Conference (P2C) and Push-to-Message (P2M) services are provided by a real-time exchange (RTX) that interfaces to the
wireless network. The RTX provides a full-duplex Push-to-Conference (P2C) session between an initiator and two or more other participants, wherein the P2C session comprises a full-duplex
conference call, and both the real time exchange and handsets participating in the P2C session communicate with each other using
call setup and in-band signaling within the
wireless network. The realtime exchange may be coupled to and work with a Push-to-Message (P2M)
server to deliver
multimedia messages in a non-real time manner from an originator to one or more recipients, without establishing voice paths between the originator and recipients, wherein the P2M
server, and an optional Voice Mail
Server, provide a message storage facility for the
multimedia messages. Additionally, a technique based on
handset speech buffering permits zero
delay call set-ups to be achieved.