Patent ID: 7668155
Filing Date: 2010-02-23
Classification: H04M

Abstract:
1. An IP telephony system comprising: a VoIP (Voice over Internet Protocol) terminal; and a gateway controller for call controlling the VoIP terminal through a transmission line, said VoIP terminal including: a jitter buffer for temporality holding a voice packet inputted through the transmission line to absorb delay; a conversion section for converting the voice packet held by the jitter buffer into a voice signal; a data memory area for holding a plurality of types of hold sound or audible sound data in a payload format of the voice packet; a data selection section for selecting a hold sound or an audible sound to be reproduced from the plurality of types of hold sound or audible sound data held in the data memory area; a switching section for selecting any one of the voice packet and the hold sound or audible sound data to output it to the conversion section; a control section for controlling writing of any one of the voice packet and the hold sound or audible sound data into the conversion section, or for commanding the conversion section to output no sound; an intermittence control section for controlling the intermittence of the hold sound or audible sound by restricting the input of the hold sound or audible sound data into the conversion section; and a periodic reproduction section for periodically outputting the hold sound or audible sound data to the conversion section; wherein said conversion section converts the voice packet and the hold sound or audible sound data held in the data memory area into the voice signal.