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multi network fusion call processing method as well as internal call processing method and Device of ims ip multimedia subsystem domain

The invention provides a multi-network fusion call processing method, as well as internal call processing method and Device of an IMS domain. The multi-network fusion processing method comprises the following steps of: receiving a call request message transmitted by a first network Boundary Device, wherein the call request message comprises an original called number in changed service carried by a first expanded entity domain; and regulating the call request message according to a call scene mode corresponding to the call request message. The embodiment of the invention provides a scheme for truly transmitting and processing called number information during fusion of an IMS network and a present network in a communication field, and ensures that the original called number in the forwarding service enters the IMS domain by expanding the entity domain of an SIP (Session Initiation Protocol) message and storing the original called number in the changed service in the expanded entity domain, thereby preventing loss caused by substituting, bringing convenience for the IMS domain to process service according to the information and improving the service quality.