在SIP安全措施上，对传统的HTTP摘要认证方式作了改进，实现了双向身份认证和密钥协商的功能。
In SIP's security measure, the method of the traditional HTTP digest authentication is improved, and the functions of bidirectional identity authentication and key negotiation are supplied.
该机制能实现双向身份认证和密钥协商功能，使SIP认证和加密更为灵活。
This mechanism provides the functions of bidirectional identity authentication and key negotiation, and makes SIP authentication and Encryption more flexible.
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