PoC (push to talk over cellular), the modern version of walkie-talkie communication, is a very promising new voice communications service in mobile radio networks. Voice messages are directly sent to one or more predefined subscribers at a keystroke. This bidirectional radio service – also used as PTT (push to talk) with only slight differences – is based on packet-switched voice transmission in GPRS, WCDMA(UMTS) or CDMA2000 networks, for example. This new form of group communications opens up new possibilities both for business customers and private users and is thus a cost-efficient alternative to telephony and SMS.
|