Patent ID: 7751349

Claim:
A signalling exchange method for guaranteeing Internet Protocol (IP) Quality of Service (QoS), which is applicable for a network with an independent bearer control layer, the method comprising: upon receiving a request from a source User Agent (UA) for transferring a user service stream, sending, by a Call Agent (CA), a QoS resource request to a source Call Manager (CM) of the bearer control layer, wherein the QoS resource request contains a stream QoS parameter and information of a destination UA; after receiving the QoS resource request from the CA, determining, by the source CM, whether the destination UA of the QoS resource request is within the management domain to which the source CM belongs; allocating resources for the user service stream on the bearer control layer according to the determination result, and sending a flow mapping command to an Edge Router (ER) according to the resource allocation result; and after receiving the flow mapping command, allocating, by the ER, a bearer path for the user service stream based on the allocated resources, and transferring an execution result to the CA via the bearer control layer.