Given these standards, you can achieve end-to-end security or secure just the part of the call that will traverse public networks. You can also transport VoIP traffic over a VPN to achieve security.
The products you use for your IP PBX or VoIP gateway must support these protocols for you to be able to make your calls secure. In addition, your network security elements (firewalls, NATs, proxies, etc.) must also be VoIP-aware. You must also realize that encrypting voice traffic has a big performance overhead on the equipment at the endpoints and thus may be able to carry less traffic.
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