snom's phones include security features based on the two VoIP security standards sips (RFC 5246) and SRTP (RFC 3711).
Service Request Transport Protocol, GE-Fanuc automation protocol for programmable logic controller
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Secure Real-time Transport Protocol, security profile for Real-time Transport Protocol
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ZRTP, a cryptographic key-agreement protocol using Secure Real-time Transport Protocol for encryption
SRTP |
offers support for TLS and SRTP to encrypt and secure signaling and media traffic
Such mechanisms may be implemented, for example, with the Secure Real-time Transport Protocol (SRTP) defined in RFC 3711.
However, the new generations of SBCs, armed with sufficient computing capacity, are able to offload this encryption function from other elements in the network by terminating SIP-TLS, IPsec, and/or SRTP.
The recent publication of new VoIP encryption standards built into the protocol, such as ZRTP and SRTP, allow the VoIP client to run without the VPN overhead, integrating with standard features of VoIP PBX without having to manage both the VPN gateway and the PBX.