The invention discloses a method of international
roaming proxy calling service, comprising that (1), international
roaming user requests a
roaming place mobile number, and requests a virtual VoIP number, (2), storing the relation information between attach place mobile number, the virtual VoIP number and the roaming place mobile number in an internal
proxy server, (3), when the attached user calls internal roaming user, an attached network gate is routed to the internal
proxy server of the attached place, to search relation information and find the roaming place mobile number, to be routed to the internal
proxy server of roaming place, to
process communication, and when the internal roaming user calls attached place user, the roaming network gate is routed to the internal proxy
server of roaming place, to search relation information and find the mobile number of attached place, to be routed to the internal proxy
server of the attached place, to
process communication. The invention can reduce communication cost of internal roaming user, and make cost clearance easy, and improve internal roaming communication amount.