Patent ID: 8112106

Claim:
A method for obtaining group information by a second PoC client in a Push-to-Talk over Cellular, PoC, session, comprising: initiating, by a first PoC client, a PoC Ad hoc session; receiving, by a PoC server, a session request message carrying information about the first PoC client initiating the Ad hoc session and session group member information from the first PoC client; sending, by the PoC server, the session request message carrying the session group member information to the second PoC client, wherein the session group member information is at least one of the following: an IP address, a user nickname, a uniform resource identifier or a phone number; receiving, by a participating function server, the session request message carrying the session group member information; when determining to send the session group member information to the second PoC client according to an answer mode of the second PoC client and supplementary information of the session request message, sending session request message carrying the session group member information to the second PoC client; when determining not to send the session group member information to the second PoC client according to the answer mode of the second PoC client and supplementary information of the session request message, deleting the session group member information, then sending the session request message to the second PoC client; and obtaining, by the second PoC client, the session request message.