Communication method, calling device, called device and communication system

The invention provides a communication method, a calling device, a called device and a communication system, and the method applied to the calling device can comprise the steps: obtaining a first number and a second number associated with the calling device in response to an operation of sending a communication notification; generating an SIP message according to the type of the communication notification, the first number and the second number; and sending the SIP message to a called device. 本公开提供了一种通讯方法、主叫设备、被叫设备及通讯系统，其中，应用于主叫设备的方法可以包括：响应于发送通讯通知的操作，获取所述主叫设备所关联的第一号码和第二号码；根据所述通讯通知的类型以及所述第一号码和所述第二号码生成SIP消息；向被叫设备发送所述SIP消息。