Abstract: A method and a system for multiplexing voice packets without delay variation even if the number of multiplexed channels is increased, wherein a packet buffering unit receives compressed voice data, and stores voice data groups during voice activity intervals in each channel as talk; a scheduling FIFO block sequentially stores the channel numbers of a predetermined number of multiplexed channels which are read according to priority over the other channels, thereby controlling reading contention. A write decision block controls writing of talk spurts in the buffer areas of the respective channels in a packet buffering unit and also controls writing of the channel numbers in the scheduling FIFO block. A scheduling FIFO controller selects channel numbers from the scheduling FIFO block and a read decision block outputs voice packets by controlling the multiplexing sequence of talk spurts of the selected channel numbers.