1. Multimedia Gateways & H.248/ MEGACO ITU Workshop on IP Networking & MEDIACOM-2004 April 26, 2001 Presented by- Clifford Sayre, Lucent Technologies

2. 2 Multimedia Gateways This presentation is the joint work of several teams: NTT DoCoMo –Takashi Suzuki - (ITU-T SG 16 delegate) NTT DoCoMo Communications Laboratories USA –Muhammad Mukarram Bin Tariq –Shahid Shoaib Lucent Technologies –Clifford Sayre - (ITU-T SG 16 delegate)

3. 3 Overview Introduction to IMT-2000 & New Capabilities Emerging Wireless Multimedia Applications H.324M/ 3G-324M Standard for Wireless Multimedia Interworking with the ITU-T H.3XX Series MEGACO/H.248 as Key Element in Interworking Gateway

4. 4 Features of IMT-2000 High Speed Data and Video Transmission –Maximum bit rate: 384kbps (outdoor), 2Mbps (Indoor) Global Mobility High quality transmission –Appropriate quality for each application can be provided –From 10-3 to 10-6 Improved Frequency Efficiency –The same frequency band can accommodate a greater number of users The network platform for the Mobile Multimedia Applications –Video Phone –Video Mail –Video Distribution (streaming / download)

5. 5 Bearers of IMT-2000 and the Type of Services Audio/Video Application over Circuit Switched Bearer –Based on 3GPP 3G-324M –Various applications with 3G-324M »Video phone »Video mail / Video answering »Audio/Visual content distribution Interworking between 3G-324M and other networks –Important to launch mobile multimedia successfully Bearers Services to be Covered Type of Bearers Voice Communication Packet Voice Non-specified Digital Audio Video Communication Internet Video phone (3GPP 3G-324M) Internet Circuit Switched Packet Switched

6. 6 Mobile Network Packet Switched Mobile Network Circuit Switched Mobile NW InternetInternet Interworking Between Multimedia Terminals Interworking with Multimedia terminal on the Internet Interworking with Multimedia terminal on the PS mobile network 3G-324M – H.323/SIP Interworking MGC MG SS7SS7 H.248 3G-324M MT (PS) (SIP/H.323) H.323/SIP

7. 7 3GPP 3G-324M Overview ITU-T developed H.324 Mobile extension (H.324M) –H.324 Annex C has been established in 98.2 –Improved error robustness »Error robust multiplexing (H.223 Annex A ~ C) »Efficient transport of H.245 control messages 3GPP extended H.324 Annex C –3G-324M has been established in 99.12 –Specified the audio/video CODECs suitable for Wireless Network »Mandatory support of AMR speech CODEC »Mandatory support of H.263 baseline »Optionally but recommended support of MPEG-4 Simple Profile @ Level 0 –Specified the multiplexing for Wireless Network »Mandatory support of H.223 Level 2 (Annex B) –Added several clarifications »Based on the interoperability test carried out by the interested companies »Described in 3G-324M Implementors Guide

8. 8 Building Blocks of 3G-324M/ H.324M H.223 multiplexed bitstream is mapped onto digital channel Bearer control messages are delivered as in-band data Modem/Mode negotiation is not applied H.223 Annex B Bearer Control H.245 Audio CODEC AMR Call Control Wireless Network I/F Video CODEC H.263/MPEG-4 Out-band In-band Wireless Network

9. 9 H.323 3G-324M Interworking With H.323 Interworking with H.323 system requires: –Mapping of Call Control Signaling –Mapping of Bearer Control Signaling (I.e. H.245) –Conversion of Media Transport Format –Media Transcoding H.223 Annex B Bearer Control H.245 Audio CODEC AMR Call Control Wireless Network I/F Video CODEC H.263/MPEG-4 Q.931/H.225.0 Bearer Control H.245 Audio CODEC Video CODEC TCP RTP/UDPIP

10. 10 Interworking with SIP Interworking with SIP requires: –Mapping of Call Control /Bearer Control Signaling to SIP/SDP –Conversion of Media Transport Format –Media Transcoding SIP 3G-324M H.223 Annex B Bearer Control H.245 Audio CODEC AMR Call Control Wireless Network I/F Video CODEC H.263/MPEG-4 SIP/SDP Audio CODEC Video CODEC TCP or UDP RTP/UDPIP

11. 11 Interworking & Gateway Decomposition Requirements for gateway –Decomposed GW shall be able to achieve the same interworking functionalities as Monolithic GW –Able to communicate with any 3G-324M/ H.324M compliant terminal –Easy to achieve compatibility between MG and MGC from different vendors –Less interactions between MG and MGC are better »For compatibility between MG and MGC »For reduction of signaling traffic (to accommodate tens of millions of customers)

12. 12 Gateway Configuration Proposed configuration –H.248/ MEGACO protocol for MGC to MG control –MGC for call control/ signaling –MG for media stream processing –MG or MGC for media stream control (H.245) varying with application –Advantages »Distributed architecture »Scalability »Synergy with converged voice/data network architectures H.248/ MEGACO advantages for multimedia –Support for multiple terminations in a call context –Media descriptors for voice & video signals –Packages provide flexibility for extensions & customization –ITU-T SG 16 to standardize packages for H.324M support

13. 13 Configuration of 3G-324M – H.323 Gateway MG TDMH.245 LC:Logical Channel NT:Network Termination H.245NT * * * MGC Call Control H.225.0 * 3G-324M wireless H.323 IP Resource Control Add/Delete H.245 termination Rough Resource Control (max. no of audio/video termination) Add/Delete H.245 termination Rough Resource Control (max. no of audio/video termination) LC H.223 Audio Video NT Control Audio/Video streams Based on H.245 signaling Follow the limitations set by MGC Control Audio/Video streams Based on H.245 signaling Follow the limitations set by MGC H.248 Bearer Control (H.245) in MG

14. 14 MG MGC Other Configuration TDMH.245 LC:Logical Channel NT:Network Termination * * * Call Control H.225.0 * 3G-324M wireless H.323 IP LC H.223 Audio Video NT H.248 Bearer Control (H.245) in MGC H.245 Resource Control Backhaul of H.245

15. 15 Complementary Standards Complementary standards from different organizations enable: –Wireless multimedia telephony –Interworking between wireless multimedia and ITU-T H.3XX series ITU-T Standards –Circuit switched standards such as H.324M –Packet switched standards such as H.323 –Interworking standards such as H.246 Joint IETF & ITU-T –Media gateway control with MEGACO/ H.248 IETF Standards –IP/ packet standards such as SDP, RTP, & TCP 3GPP Standards –Wireless standards such as 3G-324M & GSM-AMR speech ISO/ MPEG Standards –Multimedia standards such as MPEG-4 video

16. 16 Summary Emerging wireless multimedia applications –Based on 3G-324M/ H.324M –Supported as 3GPP circuit switched service Interworking to other networks –Scenarios for H.3XX series terminals –Scenarios for other terminals, such as SIP terminals Gateways to support interworking –Flexible architecture with MGC & MG elements –H.248/ MEGACO protocol for MGC to MG control Complementary standards help support interworking scenarios

17. 17 Multimedia Gateways Back up slides and additional information

18. 18 H.324M Transport Via IP Tunneling IP-based Core NW Circuit Switched Radio Access NW MGC MG H.248 3G-324M Circuit Switched Radio Access NW MGC MG H.248 3G-324M IP tunneling of 3G-324M stream 3G-324M audiovisual call via IP-based core network Save the resource of MG and core network by multiplexing audio and video stream into one connection Enable precise audio and video synchronization between GWs Bearer Independent Call Control

19. 19 Configuration of tunneling gateway Gateway for tunneling MG TDM LC:Logical Channel NT:Network NT MGC * 3G-324M MG Resource Control H.223 H.248 * MGC 3G-324M