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It is not the question "if", it is the question "when".
When an attack happens, make sure that the price to get anything useful from your PBX will be quite high.
Controlling who can access what information and who has to stay out can be achieved with these features.
More information can be found on the security whitepaper.
In areas where sensitive information needs to be exchanged over the phone, privacy has become a major concern in VoIP. In principle, it can be ensured in two ways:
Using a PKI-based trust network. In most cases, it is reasonable to encrypt the packet based on certificates and private keys, which are stored on the server and on the endpoints. It works well when you are able to keep the private key safe.
Using end-to-end encryption. In this case only the endpoints for the communication are involved in the encryption. The PBX will not be able to decode the packets, for example for recording the call.
What is ZRTP?
ZRTP negotiates the security parameters for a call not through the SIP packets, but through the media stream itself. It uses a clever trick that the persons have to read out a short text in their own voice, which is difficult for someone who would intercept the conversation.
How does Vodia support ZRTP?
The Vodia PBX detects ZRTP packets in the RTP stream and passes them through to the other side of the call. Then it is up to the involved endpoints to set up a ZRTP encrypted media stream. There are several ZRTP soft phones available for various platforms, for example Linphone or CSipSimple that work with the Vodia PBX.
Vodia offers a special firmware version for VoIP phones. Because those devices are not running any other software except the VoIP phone software itself, customers can be sure that there is no malware running on the device. This can be extremly important when highly sensitive information needs to be echanged over the phone.
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