Telepresence Interoperability Protocol (TIP)Overview for IMTC SuperOp 2010 Workshop

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Allyn RomanowCisco Telepresence Systems Business Unit (TSBU)15 June 2010

Agenda

What is TIP? Background Interesting Features Documentation Current status

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What is TIP? Telepresence Interoperability Protocol

Immediate interoperability with Cisco WHILE

working on an industry standard

Signaling media and media control – Controls media– Identifies positions and lots of functions– Uses RTCP for signaling instead of SIP/SDP

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Use Cases, Point to Point and Multi-point

TIP

MCU

TIP

Point-to-point Calls

Multipoint Calls

TIP

Call Agent

Call Agent

Background

Cisco opened up TIP to kick start multi-vendor, multi-screen interoperability while IMTC, the industry work on a suite of standardshttp://www.cisco.com/go/tip

Spec (v6, v7) and profile(s)

TIP Library Open Source project to launch by 1 Julyhttp://tiprotocol.sourceforge.net

Cisco to transfer ownership of TIP and Library to IMTC to own, govern, change control

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Features- What’s Interesting?

Using RTCP for signaling media control

Multiplexing similar RTP streams onto 1 RTP session

Switching (simulcasting) rather than transcoding

Security

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Telepresence Interoperability Protocol (TIP)

Session Establishment (SIP)

TIP Message Exchange RTCP

Data RTP

CTMS

CUCMA

Signaling Media Control

Signals endpoints multi-screen capabilities and how streams are mapped to physical devices.

Defines positional identifiers (left, right, center,aux)

Uses the RTCP private extension mechanism APP packet

– APP MUXCTRL – number and positions of media streams can transmit and receive

– APP MEDIAOPTS – AAM, G.711, Refresh, codec,feedback, algorithms

Uses RTP Contributing Source (CSRC)

RTP Muxing

Multiplexes all its video and audio streams into one video RTP session and one audio RTP session

CSRC used to demultiplex at receiver Advantages – getting through SIP B2BUAs, NAT/FW

that does not support multiple media lines of same media type

Disadvantages – non-standard

All Video Streams Share 1 Common RTP Connection

Max 4 Video Streams– Center, Left and Right Camera = 3 Video streams– Data Video = 1 Video stream

Each Camera stream is sent to the corresponding Display Data Video stream is sent to the Projector HDMI Outlet

VideoRTP Session

CTS 2CTS 1

or

All Audio Streams Share Common RTP Connection

Max 4 AAC-LD Audio Streams Center, Left and Right channels = 3 streams Line in and Audio Add-in = 1 stream

CTS 1 (In) CTS 2 (Out)

AudioRTP Session

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CUVC

Interoperability through “Switching”

New York

London H.323 or H.320 Videoconferencing

H.264 1080p or 720p

AAC-LD

Tokyo CTMS

G.722 or G.711

Any video format CUVC supportsAny audio format CUVC supports

H.264 CIF (SD interop only)

Active SegmentCascade

Video Telephony

SIP Video Telephony

Security (in v7)

Encryption (SRTP) with these key exchange approaches Point-to-point: Keys negotiated through DTLS (TLS over UDP)

in-band within the RTP media stream [RFC 5764] Point-to-multipoint: EKT (Encrypted Key Transport)

Current Status Becomes part of IMTC July 31 New IMTC working group- TIP AG

– Process for making changes to spec – Interop testing– Co-chairs

Source license management

Questions?

TIP Capabilities

1080p at 30 fps, or 780p AUX/collaboration screen, w/ maximum fps

indication (1, 5 or 30 fps) Audio Activity Metric (for multipoint switching) Enhanced Codec capability/profile negotiation,

such as CABAC, LTRP, GDR and IDR, etc. TIP feedback is ACK centric

Telepresence Interoperability Protocol (TIP)

TIP Use Cases – 3rd party Endpoints in Cisco Deployment

TIP

TIP

Point-to-point Calls

Multipoint CallsAdhoc, Scheduled, Static

CUCM

CUCM

EndpointsRegisteredTo CUCM (*)

EndpointsRegisteredTo CUCM (*)

Cisco TelePresence

Cisco TelePresence

Cisco CTMS or TelePresence Server

(*) Alternatively may connect to a separate call agent that connects to the CUCM via a trunk interface.

TIP

TIP

TIP Use Cases – 3rd party MCUs in Cisco Deployment

Telepresence Interoperability Protocol (TIP)

TIP

TrunkTo CUCM (*)

TIP

Cisco TelePresence

Cisco TelePresence

Cisco CTMS

Other MCU

Other MCU

(*) Alternatively may connect to a separate call agent that connects to the CUCM via a trunk interface.

TrunkTo CUCM (*)

TIP

TIP