The invention discloses a method and system for controlling IP (internet protocol) phone calling at a power enterprise PC client. Each station is provided with a PC and an IP phone, the PC and the IP phone are in one-to-one correspondence, the PC, the IP phone and a middle server are all communicated with a public network, the PC establishes an enterprise uniform contact list, the middle server establishes an IP phone configuration information table; the PC sends a call instruction to the middle server, and needs to deliver a calling IP number and a called phone number, the PC queries calling IP phone configuration parameters from the IP phone configuration information table according to the calling IP number, and establishes the connection with the IP phone and sends the call instruction; the IP phone receives the instruction and then executes the call operation, and sends the status to a middle server status receiving interface in the calling and talking process, the middle server feeds back the status to the PC after encapsulating the status. Through the adoption of the method disclosed by the invention, the user status in the enterprise uniform contact list can be viewed in real time, and the use is convenient.