The invention belongs to the technical field of the Internet and specifically relates to a soft switch calling method and a soft switch calling system. The soft switch calling method comprises the steps that an access gateway registers with main soft switch equipment; when the access gateway registers with the main soft switch equipment successfully, the access gateway obtains an address of a longconnection server; the access gateway periodically keeps a connection information packet with the long connection server and keeps long connection with the main soft switch equipment through the longconnection server; and the long connection server periodically sends a connection keeping information packet to the main soft switch equipment. According to the soft switch calling method and the soft switch calling system, in order to mitigate the long connection processing pressure of a soft switch server, the long connection server is independently set; the access gateway keeps a heartbeat mechanism with the long connection server; and the long connection server keeps the heartbeat mechanism with the main soft switch equipment, thereby realizing backup.