Patent ID: 7286496

Claim:
An IP network communication device, comprising: a call controller for setting a call connection of a voice channel with another communication device; a voice controller which generates packets from voice data and facsimile data, sends the packets to said other communication device, and restores voice data or facsimile data from the packets received from said another communication device; and a signal processor which mediates communication of voice data and facsimile data between an accommodated terminal and said voice controller, turns ON a regeneration quality improving function if voice data is communicated, and turns OFF a part or all of the regeneration quality improving function if facsimile data is communicated, wherein said regeneration quality improving function is a function to have a fluctuation absorption buffer perform fluctuation absorption, and wherein said signal processor inserts a predetermined time of silence pattern data into the fluctuation absorption buffer when a part or all of said regeneration quality improving function is turned OFF.