Patent ID: 8891388

Claim:
A path node determining method, used to determine, in an IP Multimedia Subsystem (IMS) network which comprises multiple signaling media gateways, signaling media gateway(s) which serves as media path node(s) of one call, for any one of the signaling media gateways in the IMS network, the method comprising: when receiving a first Session Description Protocol (SDP) offer, transmitting a first SDP offer carrying a first path parameter, wherein a network segment identifier of the signaling media gateway is added in the first path parameter of the transmitted first SDP offer; when receiving a first SDP answer for the transmitted first SDP offer, judging whether the received first SDP answer carries a second path parameter, if yes, judging, according to the second path parameter in the received first SDP answer, whether the signaling media gateway is a path node, otherwise, judging, according to the first path parameter in the transmitted first SDP offer, whether the signaling media gateway is a path node; and transmitting the first SDP answer.