Patent ID: 8401029

Claim:
A method for establishing a bearer for a GSM network, comprising: receiving, by a Mobile Switching Center (MSC) server, from a mobile station a call request message containing information about a code type supported by the mobile station; establishing, by the MSC server, a code type priority list according to the call request message, and transmitting a message for adding a wireless side end point to a Media Gateway (MGW); receiving, by the MSC server, a response message comprising a first IP address and a first port number assigned by the MGW; transmitting, by the MSC server, an assignment message containing the first IP address, the first port number and the code type priority list to a Base Station Controller (BSC); receiving, by the MSC, from the BSC an assignment response message containing a second IP address and a second port number assigned by the BSC, and a code type selected by the BSC according to a priority order in the code type priority list; and transmitting, by the MSC server, the second IP address and the second port number to the MGW.