Processing method of session initial protocol (SIP) message

Abstract

The invention relates to a processing method of a session initial protocol message. The method comprises the following steps: under the circumstances that a UE and a P-CSCF are interacted through a network address translation device and an IPSec SA is successfully established by the UE and the P-CSCF, after the P-CSCF receives the session initial protocol (SIP) message sent by the UE through the network address translation device from the entering IPSec SA, the P-CSCF sends an error response message to the UE if the outside source address identification which is used for encapsulating a UDP message and corresponds to the SIP message is different from the outside net address identification which is distributed by the network address translation device for the UE and is stored by the P-CSCF when the IPSec SA is established; and the UE reestablishes the IPSec SA with the P-CSCF after receiving the error response message. The network address translation device comprises an NAT device and a NAPT device; and the address identification comprises an IP address and / or a port number.

Description

technical field [0001] The present invention relates to the communication field, in particular to a network address translation device or a network address port translation device in an IP (Internet Protocol, Internet Protocol) multimedia subsystem when the external network IP address and / or port number assigned to the user equipment change , the processing method of the session initiation protocol message. Background technique [0002] IP Multimedia Subsystem (IMS) is a standard for next-generation networks defined by the 3rd Generation Partnership Project (3GPP). Its outstanding feature is the use of Session Initial Protocol (Session Initial Protocol) , referred to as SIP) system, communication has nothing to do with access, and has multiple capabilities such as separation of control functions and carrying capacity of various media services, separation of calls and services, separation of applications and services, separation of services and networks, and integration of mo...

AI Technical Summary

Problems solved by technology

[0063] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a processing method for session initiation protocol messages to overcome the external network IP address and / or port number bound / assigned to UE by NAT / NAPT equipment IMS user service interruption and network load increase caused by changes

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