All-IP network is the developing trend of future network

and A-interface for IP evolution corresponds with this trend. The applications of A-interface for IP evolution can effectively solve the outstanding issues in GSM voice quality

network security

network cost

maintenance management and technology evolution. From the prospect of network development

A-interface for IP evolution is urgent to be applied recently. In the paper

combined with A-interface for IP evolution pilot project

presents the key points and optimization measures in the process of transformation

it also provides reference values for the follow-up large-scale deployment.