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CHAPTER37 Advanced SBC Features

Mediant 800 Gateway & E-SBC | User's Manual

■ DTLS-SRTP (RFCs 5763/5764): Media channels must be encrypted (secured) through

Datagram Transport Layer Security (DTLS) for SRTP key exchange. For more information, see

SRTP using DTLS Protocol.

■ 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).

■ 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.

For more information on WebRTC, visit the WebRTC website at 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:

1. The WebRTC client uses a Web browser to visit the Web site page.

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AudioCodes Mediant 800 User Manual

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