Method of updating internet protocol phone contact information in general phone

The present invention is to provide a method of updating Internet protocol phone contact information in general phone which establishes a connection between an Internet protocol phone and a general phone, wherein a first contact information is stored in the Internet protocol phone while a second contact information is stored in the general phone. When it is determined that the first contact information is updated, the Internet protocol phone copies the first contact information to a third contact information, packs the third contact information to generate a changed data packet, and sends the changed data packet to the general phone. After the changed data packet is received by the general phone, the general phone stores the third contact information to replace the second contact information.