Currently popular firewall in the latest release of VoIP function, the improvement of the degree of VoIP security help a lot, of course, to protect the safety of VoIP, only the original migrated security is not enough, need according to the characteristics of VoIP is optimized, common sense for corporate VoIP system security, can adopt the following methods: protect the security of the account, in the process of build and upgrade account, to provide users with the resources should be encrypted tunnel with reliable authentication mechanism for; To protect the network security, it is better to let voice adapter can keep pace with the firewall/router; Protect the security of the call, select contains VPN function of the equipment; To ensure the safety of the service chain,
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