Multimedia via Data Networks

Agenda IP services in mobile telephony Voice over IP (High Definition) Video over IP  Video on demand  Video conferencing  Download

Data Voice Video Internet Multiservice Network Packet-Based Integrated Multiservice Networks— Data/Voice/Video SNA

Multimedia via Data Networks

GSM/3G Mobile Telephony

Talsarunu tarifi (USD/min) VoIP un Lattelekom

SIP phones Basic SIP IP phones below $ phones video phones Speakerphones PDAs with SIP software MAC, Unix, and MSoft.

Voice Quality Guidelines

Silence Suppression by Voice Activity Detection SpeechSilenceSpeech No Cells CellsCells Voice Activity Detection (VAD)

Fax over IP

H.323 MCU Responsible for managing multipoint conferences (two or more endpoints engaged in a conference) The MCU contains  a Multipoint Controller (MC) that manages the call signaling  may optionally have Multipoint Processors (MPs) to handle media mixing, switching, or other media processing

Multisite Videoconferencing MCU Streaming server

rtspd Quick-time Gatekeeper SIPUA SIP H.323 RTSP sipd sipconf sipum sip323 SIP-H.323 signaling gateway Conferencing Programmable SIP servers Unified messaging Streaming media Hardware SIP phone Desktop SIP clients sipgw PSTN MGCP SIP-MGCP gateway SIP-PSTN gateway Regular telephones A Integrated SIP Service System

ENUM example: Voice Telekom PSTN Switch nic.at43.at e164.arpa INVITE PSTN-IP Gateway * 6. INVITE PSTNInternet

ENUM example: SMS delivery MO SMS Center nic.at43.at e164.arpa MESSAGE at43 SMPP Server 2. SMS via SMPP 6. MESSAGE PSTNInternet 1. SMS an

cross-domain call ENUM session IN NAPTR e164.arpa. ?... NAPTR... DNS SRV lookup fwd.pulver.com

ENUM DNS Asterisk Linux PBX Asterisk Linux PBX PBX PBX2PBX using ENUM PCM or SIP or IAX or H IN NAPTR e164.arpa. ?... NAPTR... PCM or SIP or IAX or H.323 ENUM

Skype Based on Kazaa Overlay network  Unstructured p2p file sharing overlay  Overlay p2p network consisting of ordinary and Super Nodes (SN).  Ordinary node connects to network through a Super Node. Centralized authentication server Excellent Audio quality based on Internet Low Bit rate Codec ILBC (

iLBC – MOS (Audio Quality) behavior versus percentage packet loss

Skype Skype client listens on configured TCP and UDP ports. Uses a variant of STUN to identify the type of NAT and firewall. Usage of TCP port 80 enables client to reach super node even through firewalls. Call signaling is done over TCP, messages are preferably transported over UDP. In the presence of NAT or firewalls, calls between caller and callee are routed by an intermediate node All Skype messages are encrypted.

HD Video resolution

HD video size i HD HDV p HD CIF/ FullD1 (SD) CIF (SD) digvid

1.2 High Quality Digital Video Technologies ResolutionBandwidthDelay HDTV Uncompressed 1080i (1920x fps) 720p (1280x720 60fps) 1~1.5Gbps100msec MPEG220~80Mbps1~2 sec H.26410Mbps2~3 sec SDTV Uncompressed 480i (720x480 30fps) 250Mbps100msec DV30Mbps~300msec MPEG25~6Mbps1~2 sec 4 of 14

Video Streaming Over the Network WMV 1.5Mbps25Mbps 5Mbps 50Mbps 100Mbps 1Gbps 10Gbps HD DV MPEG4 MPEG1 DVD H Kbps MPEG2 SD QHD Bandwidth 10Mbps H.263

Lab Tests Centaurus 10 GigE Centaurus 10 GigE UltraGrid Sender UltraGrid Receiver LDK-6000 PDP-502MX Gbps RTP/UDP/IP SMPTE 292M Back-2-back tests:  Video: 720p  Duration: 10 min  RTT: 70 µs  MTU: 8800 bytes Results:  No loss or reordering  Mbps throughput  Total 10,178,098 packets sent and received

HDV over IP system MPEG-2 TS IP Network Packetizer Packetizer and MPEG2 Decoder SenderReceiver TS Packets … … RTP Packets HD Camcorder IEEE1394 Interface HD Display … … 7 of 14

i2CAT experiences with HD 2001 Open Opera  Live transmission of an Opera (La Traviata) from Liceu Opera House to a cinema both in Barcelona to compare spectators feelings.  After several tests with experts, we concluded that the only acceptable quality was uncompressed high definition i2CAT Media Gateway HDSDI SDI MPEG2 (10Mbps) CINESA Diagonal UNIVERSITIES (UPC,UdG,UdL) IPMulticast HDSDI (1,5Gbps) Liceu Opera House

Video Packetization and IP Transport RTP packetization is based on:  ``RTP Payload Format for Uncompressed Video’’, RFC 4175 Ladan Gharai and Colin Perkins RFC 4175 covers packetization of various video formats:  Supports range of formats including standard & high definition video  Interlaced and progressive  RGB, RGBA, BGR, BGRA, YUV  Various color sub-sampling: 4:4:4, 4:2:2, 4:2:0, 4:1:1

RTP RFC 1889: RTP: A Transport Protocol for Real-Time Applications RFC 2250: RTP Payload format for MPEG1/MPEG2 Video  RTP Payload contain integral number of MPEG transport packet (188byte).  Suggest several MPEG picture fragmentation rules.  RTP Header fields for MPEG2 Video 8 of 14