For VoIP security issues, the carrier is generally based on the data of many security protocols offer VoIP services, and operators can also provide binding VPN VoIP service, itself has certain security, however, to make a VoIP operator safety expectations still has many challenges, such as key exchange, encryption and SA latency problems brought by the life cycle, etc., and meet the real-time requirements of VoIP security mechanism also needs to be improved, with the use of new security measures, so as to protect the VoIP security, operators can provide an ideal high reliability and high quality of service of voice services, VoIP era will eventually replace the PSTN,
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