Voice encryption for VoIP products is also very important, at present, the industry popular two voice encryption ways: one is based on the standardized solution, using the real-time protocol, the other is their own private solution, it's also worth pointing out is that the IP phones and gateways may not support voice encryption, at the same time, advanced to 128 bit encryption system (AES), may need the support of RTU serial number, in a VoIP system, firewall can deploy on phone terminal software, but it is important to note that the PC to install a firewall will increase the time delay of calls, thus influence call quality, has been on the market at present the manufacturer provides the firewall software to be embedded to the gateway, as a result, both soft phone terminals and gateway nodes, increase the function of firewall is implemented through software,
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