Transmission of voice over IP in wireless telecommunications system

A wireless telecommunications system comprising at least one wireless mobile station, a first radio access gateway and a second radio access gateway, wherein the wireless telecommunications system is configured to provide a wireless connection to the mobile station through a base station connected to said first radio access gateway, said first radio access gateway is configured to perform protocol conversion between the wireless connection provided to the mobile station and a voice over IP connection established for the mobile station in an element of an IP-based network,

• the wireless telecommunications system is configured to define the address information of said second radio access gateway in said first radio access gateway in response to having detected a need to hand over the wireless connection of the mobile station to a base station connected to said second radio access gateway,
• the wireless telecommunications system is configured to define the address information of said first radio access gateway in said second radio access gateway,
• said first radio access gateway and said second radio access gateway are configured to transfer data addressed to and transmitted from the mobile station through said first radio access gateway and said second radio access gateway in response to the handover to the base station connected to said second radio access gateway.

A network element of a wireless telecommunications system, wherein said network element is configured to perform protocol conversion to at least one wireless mobile station between a wireless connection provided through a base station connected to said network element and a voice over IP connection established for the mobile station in an element of an IP-based network,

• said network element is configured to define the address information of a second network element in response to having detected a need to hand over the wireless connection of the mobile station to a base station connected to said second network element, said network element is configured to transmit data addressed to the mobile station to said second network element, and
• said network element is configured to transmit data received from said second network element and transmitted from the mobile station to the destination address of the data.

A network element of a wireless telecommunications system, wherein said network element comprises means for performing protocol conversion between a wireless connection of at least one mobile station and a voice over IP connection established for the mobile station in an element of an IP-based network,

• said network element is configured to define the address information of a second network element in response to a handover of the wireless connection of the mobile station from a base station connected to said second network element to a base station connected to said network element,
• said network element is configured to transmit data transmitted from the mobile station to said second network element, and
• said network element is configured to transmit data received from said second network element and addressed to the mobile station to the mobile station.