A method for transmitting packet Voice over IP, VoIP (Voice over Internet protocol), the method comprising: assigning a resource of persistent radio, which is used to assign persistent resource a specific time interval, for VoIP transmit a packet to a user equipment; make a VoIP service through a period of conversation, in which the VoIP packet using the resource persistent radio, a period of silence in which the VoIP packet is transmitted, is transmitted in a retransmission package of VoIP is commanded (instructed) for information on normal dynamic programming including a new data indicator, and that this masked (is masked) with a temporary identifier radio network cell, C-RNTI (Cell radio network temporary Identifier), persistent; persistent resource release the radio during the silence period; and make the VoIP service through the period of conversation reassigning the resource persistent radio, wherein the method further comprises: receiving a descriptor of silence before the transition to the period of silence, indicating the descriptor of silence the transition team user talk period to the silence period.