Patent ID: 7240000
Filing Date: 2007-07-03
Classification: G10L

Abstract:
1. A method of controlling a speech code in a communications system having at least two mobile switching centers capable of converting a coding process for a speech signal and interconnected by an Internet Protocol network, to control the coding process in the Internet Protocol network for the speech signal between mobile terminals registered in said two mobile switching centers while the mobile terminals are communicating with each other, said method comprising: communicating between the two mobile switching centers over said Internet Protocol network using a field in an Internet Protocol header of a packet to determine whether coding processes employed by said mobile terminals are the same as each other; if the coding processes are the same as each other, keeping unconverted the coding processes used by the two mobile switching centers for the speech signal, and transmitting the speech signal directly carried on a packet through said Internet Protocol network; and if the coding processes are not the same as each other, converting the coding processes used by the two mobile switching centers for the speech signal into a general-purpose coding process for the speech signal to be transmitted through said Internet Protocol network.