in conventional telephone services , methods of response to a call in cases where the destination caller cannot answer the call are limited , such as by playing back an answering machine message or transferring the call to another telephone system in a rigid manner . in such systems , there is no flexibility in choosing the manner of response depending on the situation of the destination caller . the invention enables the response method to be automatically selected depending on user &# 39 ; s current position information in an internet telephone system in which voice data is transmitted and received via the internet . the user registers response methods associated with network addresses in a database , and the user &# 39 ; s current position is determined from the ip address .