Abstract: A system for realizing a home agent client function for a call center system has a home agent client 90 for remotely conducting reception processing of a call center 100 by way of an internet 2 through an internet service provider 6 for connecting a public network 1 to the internet 2, and the call center 100 has connection means for connecting a telephone set 5 to the home agent client 90 through a telephone exchange system 10 based on a reception request call to the call center 100 from the telephone set 5, and conversion means for applying two-way data conversion to voice information and control information in association with the voice information to generate an internet protocol packet.