GUARANTEEING METHOD, DEVICE AND SYSTEM OF COMMUNICATION SERVICE QOS IN NAT SCENARIO

摘要

The present invention is suitable for the field of network communications. Provided is a method of guaranteeing communication service QoS in an NAT scenario, comprising: controlling an A-BGF network element to generate proxy SDP information according to the calling party SDP information when a user terminal is initiating a communication request, and establishing a connection between the user terminal and the called party utilizing the proxy SDP information to replace the calling party SDP information; informing a PCRF network element to carry out QoS resource reservation after a successful connection of two communicating parties; receiving an IP address and port of the user terminal which is NAT converted from the A-BGF network element, and informing the PCRF network element to update the resource address information about the QoS resource reservation into the IP address and port of the user terminal which are NAT converted. The present invention achieves the guaranteeing of the QoS of a communication service in an NAT scenario without any special interface requirements for the user terminal.