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Overview

The SBC supports Telepresence Interoperability Protocol (TIP) to support multi-screen conferences. The TIP protocol is used to multiplex multiple screens, multiple audio streams, and an auxiliary-data screen into respective Real-Time Transport Protocol (RTP) flows using a multiplexing technique both for audio and video data. It enables point to point and multipoint sessions and mix of multi-screen and single-screen endpoints. When a session is established, the TIP protocol specification uses RTP Control Protocol (RTCP) based Application-Defined Packets (APP) extensions to indicate profile capabilities and per media flow options. It also defines how endpoints and other devices can provide feedback or identify adjustments during the life of the streams. The SBC relays the TIP session between two endpoints.

Audio Stream

Currently, the SBC determines audio stream bandwidth using standard codec definitions. The TIP protocol uses the same stream or port to exchange packets for different screens. Thus, the bandwidth used is negotiated in the call depending on the endpoint capabilities. To achieve the higher audio bandwidth requirement, the Audio Transparency functionality can be used. The Audio Transparency feature is used to configure the audio bandwidth stream in the packet service profile (PSP). For more information on Audio Transparency, refer to SBC SIP Transparency Implementation Guide.

To configure the audio bandwidth stream in the PSP, perform the following steps:

Configuring Audio Transparency Feature

% set profiles media packetServiceProfile PS1 audioTransparency unknownCodecPacketSize 20

Configuring Audio Transparency Bandwidth Variables in PSP

% set profiles media packetServiceProfile PS1 audioTransparency unknownCodecBitRate 250

Video Stream

The SBC honors bandwidth parameters negotiated in the Session Description Protocol (SDP) exchanges. The video bandwidth stream is configured in the PSP.

To configure the video bandwidth stream in the PSP, perform the following step:

% set profiles media packetServiceProfile PS1 videoCalls maxVideoBandwith 10000

 

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