Version 7.2 775 Mediant 800B Gateway & E-SBC
User's Manual 38. Advanced SBC Features
ICE (per RFCs 5389/5245): Resolves NAT traversal problems, using STUN and
TURN protocols to connect peers. For more information, see 'ICE Lite'.
DTLS-SRTP (RFCs 4347/6347): Media channels must be encrypted (secured)
through Datagram Transport Layer Security (DTLS) for SRTP key exchange. For more
information, see 'SRTP using DTLS Protocol' on page
224.
SRTP (RFC 3711): Secures media channels by SRTP.
RTP Multiplexing (RFC 5761): Multiplexing RTP data packets and RTCP control
packets onto a single port for each RTP session. For more information, see
'Interworking RTP-RTCP Multiplexing'.
Secure RTCP with Feedback (i.e., RTP/SAVPF format in the SDP - RFC 5124):
Combines secured voice (SRTP) with immediate feedback (RTCP) to improve session
quality. The SRTP profile is called SAVPF and must be in the SDP offer/answer (e.g.,
"m=audio 11050 RTP/SAVPF 103"). For more information, see the IP Profile
parameter, IPProfile_SBCRTCPFeedback (see 'Configuring IP Profiles' on page
436).
WebSocket: WebSocket is a signaling (SIP messaging) transport protocol, providing
full-duplex communication channels over a single TCP connection for Web browsers
and clients. SIP messages are sent to the device over the WebSocket session. For
more information, see 'SIP over WebSocket' on page
776.
For more information on WebRTC, go to http://www.webrtc.org/. Below shows a summary
of the WebRTC components and the device's interworking of these components between
the WebRTC client and the SIP user agent:
The call flow process for interworking WebRTC with SIP endpoints by the device is
illustrated below and subsequently described:
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