Introduction - If you have any usage issues, please Google them yourself
A detailed description of SIP-based VoIP complex security issues and expounded on authentication, loading MIME message body to extend the SIP messages and packages, such as encryption solution. Proposed a new security framework, in the link layer and network layer (switches), transport and session layer (firewall) and the application layer (base f-jl ~. Server software, etc.) more than the implementation of safety measures to the fundamental layer solve the many security risks.