Method, user equipment, and system for opening an ad-hoc PoC session in a PoC system

摘要

A method, user equipment, and system are provided which can open an ad-hoc Push-To-Talk (PTT) over Cellular (PoC) session for a call target group whose group identifier is managed in a remote network domain when the ad-hoc PoC session is opened. A PoC client requesting session initiation sends, to a first PoC server of a home network, a session INVITE message containing information of at least one group identifier. The first PoC server checks the group identifier information and sends a group list information request message to a second PoC server hosting a group identifier when identifier information of a network group other than the home network is included. The second PoC server acquires list information about a group in the request message and sends the information to the first PoC server.

主权项

1. A method for opening an ad-hoc Push-To-Talk (PTT) over Cellular (PoC) session in a PoC system, including a first PoC server and a second PoC server, comprising the steps of:
receiving, by the first PoC server, a session INVITE message from a PoC client requesting session initiation, the session INVITE message including information of at least one group identifier; checking, by the first PoC server, the at least one group identifier included in the session INVITE message received by the first PoC server; sending a group list information request message including the at least one group identifier and a value indicating a conference server, from the first PoC server, to the second PoC server hosting a group list corresponding to the group identifier; and receiving group list information, at the first PoC server, from the second PoC server, in response to the group list information request message.