Method and system for the user of a traditional terminal to access an IMS domain

摘要

The invention relates to an implementing method and a system for a traditional terminal user accessing an IMS domain. The method allocates an IMS domain user identification including a public identification and a private identification to a traditional terminal user on the AGF entity controlled by the AGCF entity, and establishes the mapping relation between the IMS domain user identification and the line identification of the user. When receiving a command or message for a certain user terminal sent from the AGF entity, the AGCF entity determines the IMS domain user identification of the user according to the mapping relation and sends the corresponding SIP message to the IMS domain. The invention also provides a communication system.