1	What You Need to Know About Making IP Videoconferencing Work! Sal DeAngelo, ProjectVIEW Paul Rubeo, Ulster BOCES NYSCATE – November 25, 2003
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3	What is ProjectVIEW? Federal Technology Innovation Challenge Grant — Virtual Information Education Web 2000 – 2005 Collaboration and exchange of ideas between teachers and informal education providers (including zoos, museums, historic and cultural centers) through videoconferencing and other digital communications.
4	Introduction What is H.323? H323 is an [ITU] standard that describes the protocols, services and equipment necessary for multimedia communications [audio, video & data] on Packet Based Networks [PBN] without a guaranteed QoS [Quality of Service]. These networks may include technologies like Ethernet, Fast Ethernet, Token Ring and Gigabit Ethernet and protocols like IP [Internet Protocol] and IPX.
5	Standards
6	Variables to Contend With Infrastructure Connectivity/Bandwidth Firewalls Gatekeepers Gateways QoS
7	Infrastructure/Connectivity/Bandwidth Local Area Network - LAN Ethernet, Fast Ethernet, Gigabit Ethernet Wide Area Network - WAN ATM, T1, ISDN Network Capacity – it’s all relative! Converged networks -Voice, Video & Data Internet Access T-1, T-3, Broadband, SDSL
8	Connectivity/Access to Bandwidth T-1 [1.5Mbps] T-3 [45 Mbps] Broadband [1.5Mbps x 768Mbps] Symmetry [download vs upload speed] Multiple Strategies Packet Shaping – maximizing what you have!
9	IP Video Conferencing Bandwidth
10	Packet Shaping Shaping controls bandwidth utilization and application performance by actively preventing network congestion. Shaping products allow you to ensure true QoS for mission-critical applications.
11	Packet Shaping Benefits: Eliminate the network as the source of performance issues. Quickly fix performance of critical applications by ensuring that bandwidth resources are allocated appropriately. Stop the cycle of bandwidth upgrades -- reclaim bandwidth by controlling recreational and malicious traffic and preventing inefficient networks. Control network congestion, traffic latency, and application response times (overcomes queuing deficiencies in routers and other devices).
12	IP Addressing Private Internal LAN IP addressing Public External – Outside appearance on Firewall Internal – Public IP addresses available to desktop NAT – Network Address Translation Relationship between internal and external addesses Static Dynamic
13	Firewalls – Proxy Servers Firewalls – by definition protect the resources of a private network from the users of other networks. Standard – uses access control lists or conduits Intelligent – state full inspection of packets Multiple Firewalls Proxy Servers – acts as an intermediary between a workstation user and the internet allowing the enterprise to ensure security and administrative control. It also can provide a caching service
14	The Firewall Problem Blocks Inbound Calls Resolving this means “opening” ports Increase in open ports, Decrease in Security
15	Firewall Ports 80 -Static TCP -HTTP Interface (optional) 389 -Static TCP -ILS Registration (LDAP) 522 – Static TCP - User Location Server (ULS) 1503 -Static TCP -T.120 1718 -Static TCP -Gatekeeper discovery 1719 -Static TCP -Gatekeeper RAS 1720 -Static TCP -H.323 call setup 1731 -Static TCP -Audio Call Control 8080 -Static TCP -HTTP Server Push (Optional) 1024-65535 -Dynamic TCP -H245 1024-65535 -Dynamic UDP -RTP (Video Data) 1024-65535 -Dynamic UDP -RTP (Audio Data) 1024-65535 -Dynamic UDP -RTCP (Control Information)
16	NAT- Network Address Translation IP address translation between an internal private address [10.x.x.x] and a public IP address. Static – a one to one correlation between an internal and public IP address Dynamic – internal IP address accesses a pool of public IP addresses when needed. Limited to each session. Allows for large number of uses to access a select or limited number of public IP addresses [v4]
17	Gatekeepers What are they? Why do we need them? Optional Call Admission to accept or deny calls Translation of E.164 aliases to IP addresses Bandwidth management of incoming or outgoing calls Zone management Can provide call forwarding Help manage H323 MCU sessions
18	Gatekeepers What are they? Why do we need them? Typically a software product that resides on a server. Gateways and MCU can have embedded gatekeepers. In general stand alone gatekeepers provides more features than the embedded type.
19	Gatekeepers
20	Gatekeepers – Manage/Restrict Access to Resources
21	Management Programs
22	VCON’s – Media Exchange Manager
23	LDAP – Directory Services
24	Putting it all together ProjectView diagram.
25	Possible Connection Scenarios
26	H.320 – H.323 Gateway
27	Why? -ISDN Content Providers Buffalo Zoo Center for Puppetry Arts Guggenheim Museum Louisville Science Center Museum of Modern Art Ocean Institute Philadelphia Museum of Art The Globe Theater
28	Content Providers That Can Do Both ISDN and IP Albany Institute of History and Art Albright Knox Museum Cincinnati Zoo Cleveland Museum of Art COSI Toledo Health Museum of Cleveland Mote Marine Laboratory NASA Glenn Smithsonian Environmental Research Center
29	H.323 – H.320 Gateway
30	Videoconferencing Over The Internet
31	ISDN vs IP
32	The Dollars and Sense of It!
33	The Dollars and Sense of It!
34	How do we IP? Software CODEC’s Hardware based CODEC’s PC Centric Appliances Set Top Rack mounted for integration Both Hardware and Software based CODEC’s
35	Software CODEC’s NetMeeting CUseeMe iSight - Apple vPoint - VCON Do they work? Applications?
36	Hardware CODEC’s PC Centric Appliances Set Top Desktop Top USB Rack mounted for integration
37	Jitter and Latency
38	Lip Sync and Packet Loss
39	Why Engage in Videoconferencing? Is to enhance standards based curriculum delivery. To deepen understanding K-12 curriculum through the dynamics of interactive technology To provide resources not available through the ordinary classroom structures.
40	www.projectview.org Schenectady City School District
41	You Now Know What You Need to Know To Make IP Videoconferencing Work! Sal DeAngelo, ProjectVIEW- sal@projectview.org Paul Rubeo, Ulster BOCES NYSCATE – November 25, 2003
42	Questions & Answers