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| | H.323 Mediated Voice over IP: Protocols, Vulnerabilities & Remediation |
 | | PER is a compact binary encoding that is used on limited-bandwidth networks. | | | It is designed to optimize the use of bandwidth, but the tradeoff is complexity: decoding PER PDUs (protocol data units) has lead to problems due to a number of factors including issues with octet alignment, integer precision, and unconstrained character strings. | | | An IBM executive was once quoted as saying, "Our goal is to make the computer as easy to use as the telephone". |
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http://www.securityfocus.com/infocus/1782
(2465 words)
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| | Dictionary and Encyclopedia - "Q" Listings |
| | SIP error codes are a superset of HTTP error codes (ie: 401=Unauthorized) ("H.323 exchanges binary information and is well suited to operation in the PSTN ISDN environment but can not take advantage of DNS for name resolution. | | | Because H.323 was very telephone-company-centric an alternative protocol was created (Session Initiation Protocol; SIP) that was more consistent with the way the routed Internet worked. | | | With the advent of Voice-over-IP the first approach taken to perform call setup and management was to create a protocol that was, in many ways, similar to Q.931/Q.2931. |
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http://www.connect802.com/encyclopedia/compare_sip_h323.htm
(1695 words)
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| | H.323 & SIP Videoconferencing |
| | SIP differs from H.323 at a fundamental level: in SIP, the " intelligence" in distributed out to clients (i.e., their computers) in a more distributed architecture, as opposted to the H.323 model of an intelligent central coordinating site surrounded by "dumb" terminals. | | | While most H.323 implementations are proprietary, there is also an open source forum (www.openh323.org) with which our group used to participate. | | | In addition to support for H.323, including the T.120 standard (e.g., including platform-independent support for chat, file transfer, shared white board), it provided support for application-sharing on the Windows platform. |
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http://www.eng.mu.edu/rehab/Rehab167/Mod3/teleconf/h323-sip.htm
(1542 words)
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| | Firewalls and H.323 |
| | For more information on the interworkings of H.323 proxies, visit the Intel or VTEL H.323 and firewall information pages. | | | This may be a better option for those who plan to use videoconferencing on a regular and frequent basis, but it is the direction the industry seems to be moving to solve this problem. | | | Despite the problems firewalls impose to successfully using H.323 videoconferencing, there are ways to overcome this obstacle. |
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http://erris.med.virginia.edu/tech/FIREWALL.HTM
(786 words)
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| | PROTOS Test-Suite: c07-h2250v4 |
| | The purpose of this test-suite is to evaluate implementation level security and robustness of H.225.0 implementations. | | | In order to achieve a robustness baseline for H.323 products this test-material should be adopted for their evaluation and development. |
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http://www.ee.oulu.fi/research/ouspg/protos/testing/c07/h2250v4
(4334 words)
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| | H.323 |
| | The PX3230S H.323 SDK is specifically designed for host-based platforms such as Microsoft win32 and Unix-based hosts. | | | This H.323 signaling stack consists of an object oriented, highly flexible, high-level API written in the "C++" programming language. | | | Currently, this H.323 protocol stack is available for the Sun Solaris, Microsoft Windows win32, and Linux platforms; others platforms are available by customer demand. |
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http://www.nine-9s.com/prod_H_323_protocol_stack.htm
(469 words)
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| | Intel® Internet Video Phone - Firewalls |
| | The H.323 standard pre-defines a number of Gateway devices; this list will expand as gateways are developed to bridge to other environments. | | | This `decoder ring' was created to help the Intel development team understand how H.323 compares to the technology used in early versions of ProShare® Video Conferencing software. | | | This document is intended for implementers - both firewall developers planning to implement H.323 support and H.323 application developers planning to add proxy support to their products. |
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http://www.chebucto.ns.ca/~rakerman/articles/ig-h323_firewalls.html
(8586 words)
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| | H.323 Primer - an introduction to H.323 |
| | Often, these entities are implemented in software and it can be possible to have more than one entity installed on a single computer. | | | It has been argued that SIP is more suited to Internet applications and is easier to implement in software. | | | H.323 ties together a number of other protocols defined by the |
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http://www.voip-calculator.com/h323primer.html
(1696 words)
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| | Cisco Security Advisory: Vulnerabilities in H.323 Message Processing |
| | H.323 deep packet inspection is only done on packets with a source or destination port of 1720. | | | To determine if your Cisco IOS device is processing H.323 traffic and is possibly vulnerable, it is necessary to understand the three different ways that Cisco IOS software processes H.323 traffic. | | | In this example, the address 1.0.0.5 is an externally routable address for which the router is performing NAT to a local network address. |
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http://www.cisco.com/warp/public/707/cisco-sa-20040113-h323.shtml
(4638 words)
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| | H.323 plugin for Ethereal |
| | They asked me to create a network sniffer which was able to decode H.323 traffic, while I was getting practical experience for my study, Computer Science. | | | OpenH323, the creators of the library the H.323 dissector is based on | | | For now H.450 is the only main protocol not supported by Ethereal yet, but I am developing support for that. |
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http://www.voice2sniff.org
(256 words)
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| | NAT/H.323 |
| | H.323 is a first step requirement if my conferencing software, from vendor X | | | Microsoft had almost no input into the early development of H.323. | | | IPX over Ethernet, Fast Ethernet and Token Ring network technologies. |
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http://www.tuketu.com/dsl/nat2.htm
(634 words)
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| | H.323 - ISDN Gateway |
| | This makes it possible for an ISDN user to call a H.323 user directly. | | | Errors and some other informations are logged using Linux's syslog() feature. | | | This gateway has got two major problems at the moment, that makes the program a development and not a production version: |
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http://www.telos.de/linux/H323
(456 words)
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| | Take a SIP, but don't bury H.323 |
| | Vendors could manipulate the H.323 specification so much that it was possible to have an "H.323-compliant" device that could not interoperate with another vendor's "H.323-compliant" device. | | | Being a text-based protocol, SIP implementations are easier to develop and debug. | | | Vendors could develop their own proprietary algorithms that provided better voice quality and less latency. |
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http://www.networkworld.com/columnists/2004/0607yoke.html?nl
(1142 words)
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| | H.323 Analyzer download Resources |
| | A bundled H.323 packet analyzer for Microsoft Network Monitor severed as an example to use the tool... | | | Analizer The H.323 Protocol analyzer is a supplementary software product. | | | VoIP Monitoring Software Artiza VoIP Analyzer ver1.4 Artiza VoIP Analyzer is the software for analyzing VoIP-related protocols, (H.323, MEGACO (H.248), MGCP, SIP, etc), which captures... |
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http://www.seekvoip.com/dir/H.323-Analyzer-download.php
(2243 words)
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| | OpenH323 Project |
| | The OpenH323 project aims to create a full featured, interoperable, Open Source implementation of the ITU-T H.323 teleconferencing protocol that can be used by personal developers and commercial users without charge. | | | OpenH323 development is coordinated by Quicknet Technologies Inc. | | | We are available to provide contract expertise in development, analysis or enhancement of your H.323 and VOIP products or projects. |
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http://www.openh323.org
(492 words)
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| | H.323/H323 |
| | This software is modular and can be executed as a single task under a variety of operating systems or it can be executed standalone with its own microkernel. | | | VOCAL Technologies’ packet-based multimedia communications software libraries include a complete IT compliant H.323. | | | VOCAL Technologies' packet-based multimedia communications software libraries include a complete IT compliant H.323. |
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http://www.vocal.com/data_sheets/h323.html
(199 words)
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| | High End H.323 Videoconferencing |
| | Individual staff/faculty/student will be responsible for learning how to use technology, security and scheduling the use of the resource(s). | | | Support comprehensive configuration for audio, video and collaborative computing. | | | Conferences should adapt to endpoints with various capabilities. |
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http://www.vccs.edu/its/guidelines/H.323_High_End_Systems.htm
(1489 words)
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| | NetMeeting h.323 and a NAT router |
| | This is not an easy task since the router must search each incoming packet for signs that it might be a netmeeting packet. | | | Since I do not have all of these routers, I was unable to actually test them all for full functionality. | | | If you have a broadband router or broadband gateway that supports a DMZ you can get NetMeeting working on ONE computer. |
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http://www.homenethelp.com/help/netmeeting-router.asp
(881 words)
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| | H.323 Corner |
| | SnifferPro from Network Associates Sniffer Technologies division is a s/w H.323 analyser (it also does other protocols). | | | For now I think this will be just a hodge-podge of information that is H.323 related. | | | I am generally trying to keep to information relative to SOHO or home NetMeeting user but that could vary if I find some other interesting products. |
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http://www.meetingbywire.com/netmeetingh323.htm
(291 words)
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| | netfilter patches: H.323 |
| | To: netfilter-devel@lists.samba.org Subject: [PATCH] H.323/netmeeting conntrack/NAT helpers (fix) Hello, Attached is the fixed H.323 conntrack/NAT patch for p-o-m. |
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http://www.kfki.hu/~kadlec/sw/netfilter/h323-4.html
(44 words)
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| | H.323 Protocols Suit - DVB H.225 H.225 Annex G H.235 H.245 H.450.1 H.450.2 H.450.3 H.450.4 H.450.5 H.450.6 ... |
| | In an H.323 environment, where endpoints may commonly be directly associated with general purpose computers, applications such as automated message retrieval may be envisioned. | | | These networks dominate today’s corporate desktops and include packet-switched TCP/IP and IPX over Ethernet, Fast Ethernet and Token Ring network technologies. | | | In contrast to full-featured H.323 devices (many implementations of which are PC-based), the so-called Simple Endpoint Types (SETs) may be implemented in inexpensive stand-alone boxes, the most prominent example being the simple telephone. |
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http://www.protocols.com/pbook/h323.htm
(4857 words)
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| | H.323 Forum |
| | Delta Information Systems' H.323 Protocol Analyzer (combined hardware and software) | | | engram AG (software, H.323 call center, based on RADVision's stack) | | | Microtronix Systems Model 502 (programmable test system that includes hardware and software) |
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http://www.h323forum.org/products
(348 words)
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| | H.323 - voip-info.org |
| | The H.323 channel in Yate it's considered to be the best free implementation based on OpenH323. | | | Yate it's free software (open source) that use OpenH323. | | | H.323 was designed from the outset with multimedia communications over IP networks in mind, making it the perfect solution for real-time multimedia communication over packet-based networks. |
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http://www.voip-info.org/wiki-H.323
(550 words)
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| | H 323 |
| | In theory, H.323 should enable users to participate in the same conference even though they are using. | | | Save This page describes the term H..323 and lists other pages on the Web where you can find additional information. | | | This project started in February 2000, when I started to work for Philips Business Communications in Hilversum, the Netherlands. |
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http://buy-phone.zalp.net/page-h-323.html
(394 words)
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| | H.323 Multimedia Conferencing Standard (Linktionary term) |
| | An important feature of H.323 is that it defines multimedia communications over packet-switched networks, regardless of the underlying physical topology. | | | That includes voice and videoconferencing in point-to-point and multipoint configurations using desktop computers or audiovisual devices. | | | G.711 (audio coding at 64 kbits/sec) is required, but more efficient protocols are available. |
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http://www.linktionary.com/h/h323.html
(1064 words)
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| | H323 basics |
| | However, we have a fast growing user base that are either using or plan to use H.323. | | | Not required reading, this tutorial will help you to know why our network design recommendations and codec recommendations exist and why you should follow them. | | | The standard is up to Version 4 now. |
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http://www.ncesd.net/IVC/H323/H323Basics.htm
(472 words)
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| | VON & H.323 Buyers Guide at TelephonyWorld.com |
| | Activity around H.323 is especially high due to the unified support of a global coalition of companies, including personal computer and communications systems manufacturers, and operating systems makers. | | | Take a look at the featured companies listed in the right hand column to learn more about VON and H.323 Solutions. | | | H.323 is the globally accepted standard for audio/video/data communication. |
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http://www.telephonyworld.com/von323/von323.htm
(267 words)
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| | H.323 IVC |
| | Firewalls: not exactly H.323 friendly, we present solutions that have worked in the test lab or at other sites. | | | WA-K20 and NCESD continue to research the latest developments in videoconferencing equipment and networking solutions. | | | Much work has been put into this standard to make it the standard of the future. |
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http://www.ncesd.net/IVC/H323/h323.htm
(303 words)
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| | Videoconference In H.323 Articles Videoconference In H.323 Web-Page |
| | D e s I e n volume 8.10 november 2003 focus internet protocol video the h.323 videoconference team by jamie poindexter, operations manager, instructional communications systems, university of. | | | And research users on advanced ip networks around the world. | | | Cnet shopper computer systems networking modems where to buy ip vc 3540 h.320 h.323 videoconference gateway module 2 pri find pricing and availability search by part number, product. |
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http://www.videowebconferenceguru.com/videoconference-in-h.323.html
(1005 words)
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| | IP Ports and Protocols used by H.323 Devices |
| | Conferencing successfully through a firewall depends upon how well the firewall is capable of dealing with the complexities of the H.323 protocol. | | | The latest releases of Sony's, Polycom's and VCON's software all support NAT and allow you to specify the external IP address of the selected endpoint. | | | IP Ports and Protocols used by H.323 Devices |
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http://www.teamsolutions.co.uk/tsfirewall.html
(1422 words)
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| | RTP: H.323 |
| | Demystifying Multimedia Conferencing Over the Internet Using the H.323 Set of Standards, James Toga and Hani ElGebaly, Intel Technology Journal, 2nd Quarter 1998. | | | In order to take advantage of gatekeeper procedures and for other reasons, however, future versions of NetMeeting will set up the H.323 call first and then add on the logical channel for T.120." | | | Because NetMeeting was originally a T.120-based product (without H.323 support), it sets up the T.120 (data conference) call first, and then the H.323 call. |
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http://www.cs.columbia.edu/~hgs/rtp/h323.html
(153 words)
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| | OpenGatekeeper H323 Proxy |
| | I was project manager and head of St. Petersburg (Russia) office where major development work was done. | | | Pay less take more - select your protocol (SIP or H.323) and pay less! | | | Registered users will receive PSGw 2.0 for free. |
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http://openh323proxy.sourceforge.net
(615 words)
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| | Chapter 11: Understanding the H.323 Standard |
| | Users can choose the codecs that best support their computer and network selections. | | | H.323 computers and equipment can carry real-time video, audio, and data, or any combination of these elements. | | | H.323 terminals must be able to send and receive A-law and μ-law coding algorithms (also known as G.711), as determined by the International Telecommunications Union, Telecommunication Standardization Sector (ITU-T). |
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http://www.microsoft.com/windows/NetMeeting/Corp/reskit/Chapter11
(2363 words)
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| |
| | H.323 - Techabulary |
| | The most recent version is H.323 version 5 (2003). | | | When referring to the system and set of documents, people generally refer to "H.323", though not every document is mandatory as part of a standard H.323 system. | | | IP networks, primarily, though H.323 may also operate over other packet-switched networks. |
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http://www.techabulary.com/h/h323.html
(229 words)
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| | TEDAS Technology GmbH |
| | The software is especially notable for its low resource consumption and simple, object-oriented programming interface. | | | Platform independence and compatibility with all microprocessors available on the market facilitate the use of the stack in embedded systems such as PDAs, router or IP telephones. | | | Short loading times, small code sizes and the ability to be employed in multithreadig or multiprocessor environments predestine Phoneware H.323 Stack for very large Gateway or Gatekeeper systems with a high connection volume and large user base. |
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http://www.tedas.de/english/stacks.htm
(343 words)
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| | H.323 |
| | Advanced features gain support and first H.323 to SIP interconnections demonstrated, but more work needs to be done. | | | H.323 defines four major components for a network-based communications system: terminals, gateways, gatekeepers, and multipoint control units (MCU). | | | H.323 is part of a larger series of ITU-T communications standards for voice, data, and videoconferencing. |
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http://www.networkworld.com/details/499.html
(934 words)
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| | K20 H.323 Endpoint Setup |
| | Different manufacturers describe these settings in different ways, so you may need to contact your vendor for assistance. | | | H.323 Extension (dialedDigits, E.164, Gatekeeper alias, User number, etc.): set this to the H.323 alias number assigned to your system by K20. | | | To configure your endpoint you need to set the gatekeeper, H.323 name, and H.323 extension in your own system. |
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http://www.wa-k20.net/services/h323_endpoint_setup.html
(500 words)
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| | h 323 voip |
| | Build your own VOIP system with free H.323 software. | | | OpenH323 Gatekeeper - The GNU Gatekeeper for H.323 VOIP Systems | | | Quintum Technologies provides H.323 Voice over IP (VoIP) solutions for business applications. |
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http://www.businesstelecom.net/conference-equipment/h-323-voip.html
(140 words)
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| | free h.323 - an entity concept for you and me |
| | General Reference Material, White Papers, Standards, Implementation, Docs, FAQ, Software Distributions, Vendors, Products, MBone, Mash, CU-SeeMe, Netmeeting, DataBeam, nCast, free h.323 Development, and related H.323 subjects are located on this page. | | | free h.323 - an entity concept for you and me |
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http://www.h323.org
(52 words)
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| | h.323 protocol :: VoIP providers |
| | Billing Software, Call Relay VoIP Solutions, Call Routing VoIP Solutions, H.323 Softswitch & CPE, H.323 VoIP Gateway, IP devices, Termination | | | Billing Software, H.323 VoIP Gateway, H.323 Wireless/ GSM VoIP Solutions, Installation and Support Services, Partnering for Origination and Termination, Project Mangement Services, Termination | | | Billing Software, Installation and Support Services, IP devices, Phone To Phone, Project Mangement Services, SIP VoIP Gateway, System Integration, Termination |
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http://www.voip-list.com/protocols/h323.html
(2422 words)
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| | RFC 2824 (rfc2824) - Call Processing Language Framework and Requirements |
| | This may be a SIP user agent or an H.323 terminal. | | | This may use the same mechanism as the script server uses to report language errors to the user (see section 12.5). | | | General terminology used in this document includes: user location: The process by which an Internet telephony device determines where a user named by a particular address can be found. |
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http://www.faqs.org/rfcs/rfc2824.html
(6868 words)
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| | H.323 vs. SIP |
| | H.323 emerged around 1996, and as an International Telecommunication Union standard was designed from a telecommunications perspective. | | | As the older standard, H.323 has been embraced by many of the early VoIP players, so it has the advantage of being implemented first. | | | Session Initiation Protocol (SIP) is a standard introduced by the Internet Engineering Task Force in 1999 to carry voice over IP. |
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http://www.networkworld.com/newsletters/converg/2002/01416213.html
(576 words)
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| | H.323 - a Whatis.com definition |
| | H.323, which describes how multimedia communications occur between | | | This recommendation was announced in August 2000, by the ITU-TU Study Group 16 and the Megaco Working Group of the Internet Engineering Task Force (IETF). | | | Find white papers, products and vendors related to H.323. |
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http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci516602,00.html
(304 words)
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| | Cisco - Understanding H.323 Gatekeepers |
| | Ensure that you use the H.323 Gatekeeper functionality feature, which is denoted as x- on the Downloads ( | | | See the H.323 Network Scaling with Gatekeepers section for more information. | | | This document provides a comprehensive introduction to the functionality and operation of the gatekeeper in H.323 Voice over IP (VoIP) networks. |
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http://www.cisco.com/warp/public/788/voip/understand-gatekeepers.html
(1696 words)
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| |
| | What is H.323? |
| | H.323 was the first standard for VoIP, but is being supplanted by SIP. | | | Gateways nterface the H.323 network with other networks, including PSTN (Public Switched Telephone Network) and other H.323 networks. | | | H.323 is an ITU standard multimedia conferencing protocol, which includes voice, video, and data conferencing, for use over packet-switched networks. |
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http://www.tech-faq.com/h.323.shtml
(243 words)
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| | H 323 Voip |
| | The protocols in the H.323 protocol suite are: | | | Internet Telephony - An Overview Including comparison between SIP and H.323. | | | Use the sidebar links to browse other categories and find more information about voip. |
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http://www.indexpark.com/voip/h-323-voip
(264 words)
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