AudioCodes Mediant 800B User Manual page 686

Figure 35-4: Example of WebRTC for Click-to-Call Application
Note:
•
The WebRTC feature is a license-dependent feature and is available only if it is
included in the Software License Key that is installed on the device. For ordering
the feature, please contact your AudioCodes sales representative.
•
The maximum concurrent WebRTC sessions (signaling-over-secure WebSocket
and media-over-DTLS) supported by the device is 100.
The WebRTC standard requires the following mandatory components, which are supported
by the device:

Voice coders: Narrowband G.711 and wideband Opus (Version 1.0.3, per RFC
6176).

Video coders: VP8 video coder. The device transparently forwards the video stream,
encoded with the VP8 coder, between the endpoints.

ICE (per RFCs 5389/5766/5245): Resolves NAT traversal problems, using STUN and
TURN protocols to connect peers. For more information, see ''ICE Lite''.

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'' on page 212.

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
396).
User's Manual
Mediant 800B Gateway and E- SBC
686 Document #: LTRT-10296