| 摘要 |
A PTT (push to talk) system for a PoC (push to talk over cellular) network comprises a terminal device and a PTT management server interacting via a connection network. The PTT management server is configured to set up a unicast connection between the PTT management server and a source terminal device and a multicast connection between the PTT management server and a destination terminal device according to a call request from the source terminal device; and to receive an uplink media stream and transmit a downlink media stream. The unicast connection is used for transmission of the uplink media stream from the source terminal device to the PTT management server, and the multicast connection is used for transmission of the downlink media stream from the PTT management server to the destination terminal device. The present invention can implement PTT transmission of audio, image, data, etc. with a simple network structure. |
