| 摘要 |
<p>A mobile system comprising a communication group for IP-based group speech communication, as well as an access network and a packet data network connected to it for transmitting IP data packets between the terminals of the communication group and a group speech communication server. A terminal of the communication group sends an IP-based start-p request for IP-based group speech communication to the group speech communication server. Connected to the group speech communication server, there is a server unit which checks the load situation of the network used by at least one terminal belonging to the communication group, and if at least one parameter determining the load exceeds a predetermined limit value, the server unit establishes an instant messaging (IM) connection to the terminal, converts the IP-based voice packets addressed to the terminal into text-format IM messages, and transmits the IM messages to the terminal via an IM connection. <IMAGE></p> |
