DYNAMIC CODEC SELECTING SYSTEM FOR A VOICE CALL SERVICE IN A NEXT GENERATION NETWORK MEDIA GATEWAY SYSTEM AND A SELECTING METHOD THEREFOR, ESPECIALLY WITH REGARDS TO ACTIVELY SELECTING A CODEC ACCORDING TO NETWORK CONGESTED SITUATIONS BY USING STATISTICAL INFORMATION COMPLETED UNTIL NOW FOR A VOICE CALL

摘要

PURPOSE: A dynamic CODEC selecting system for a voice call service in a next generation network media gateway system and a selecting method therefor are provided to observe congested situations of a transfer network while an analog voice call is changed into a packet, and to actively select CODECs according to the observed network situations, thereby reducing congestions. CONSTITUTION: A subscriber interface(110) decides whether a subscriber attempts calling, and identifies call attempt information on a voice call attempt. A subscriber information searcher(120) searches a subscriber DB(150) by using the call attempt information, and decides whether the subscriber uses a variable CODEC. If so, the call attempt information is transmitted to a CODEC selecting device(140). An MEGACO protocol interface(130) receives information on each CODEC transmission rate and the number of transmission bytes as statistical information for recently completed voice calls, and stores the received information. The CODEC selecting device(140) decides network congested situations by using the statistical information and CODEC variable coefficients, and selects a CODEC for a newly set voice call service.