Internet protocol multimedia subsystem component providing of packet-switched switching functions to serving mobile switching center feature server

An apparatus, comprising:

• a serving mobile switching center feature server that translates between a call control message originated by or terminated to a mobile telephone and an internet protocol based procedure message;
• and
• an internet protocol multimedia subsystem component that serves to propagate the internet protocol based procedure message;
• wherein the internet protocol multimedia subsystem component provides packet-switched switching functions to the serving mobile switching center feature server based on the internet protocol based procedure message;
• wherein the call control message comprises a call setup message to initiate a call, wherein the mobile telephone sends the call setup message to the serving mobile switching center feature server on a signaling path;
• wherein the serving mobile switching center feature server supports a media path to carry a communication associated with the call;
• a media coordinator, wherein the serving mobile switching center feature server sends the internet protocol based procedure message to the media coordinator;
• wherein the media coordinator determines based on the internet protocol based procedure message whether the communication on the media path requires translation;
• wherein the internet protocol multimedia subsystem component comprises a break out gateway control function;
• wherein the media coordinator sends the internet protocol based procedure message to the break out gateway control function;
• wherein the internet protocol based procedure message comprises a telephone number of a recipient of the call, wherein the break out gateway control function converts the telephone number of the recipient to connection information of an address to send the internet protocol based procedure message;
• a gateway mobile switching center feature server, wherein the gateway mobile switching center feature server contacts a home location register to retrieve a temporary local directory number of the recipient of the call;
• wherein the internet protocol multimedia subsystem component comprises a media gateway control function that translates between a call control message originated by or terminated to a public switched telephone network and the internet protocol based procedure message;
• wherein the break out gateway control function comprises a first break out gateway control function, wherein based on the connection information of the address the first break out gateway control function sends the internet protcol based procedure message to any of a second break out gateway control function, an instance of the media gateway control function, and an instance of the gateway mobile switching center feature server.