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| icc_2003 delay, Messenger, silence, end-points, Net2Phone, Cisco, audio, packet,
NetMeeting, Pingtel, gaps. Abstract--- We evaluate the
QoS of a number of VoIP endpoints, in terms of mouth-to-ear (M2E) delay, clock
skew, silence suppression behavior and robustness to packet loss. Even more surprisingly, while Messenger XP has been touted as the best Messenger implementation, our experiments show that Messenger on Windows 2000 consistently achieves a lower M2E delay, with exactly the same hardware. If the skew rate from A to B is r, then a positive r means the M2E delay has an increasing trend, thus A's clock is faster than B's. Between two Cisco phones, the skew is almost zero, probably because they use the same type of oscillators. 11114_TDMoIPvsVoIPv voice, network, signaling, bandwidth, TDMoIP, VoIP, packets, transport, PBX, protocols, compression. -- Connecting traditional voice, video and data over IP/Ethernet/MPLS networks has become an attractive alternative to running parallel voice and data networks. Obstacles -- Since Voice over IP (VoIP) was first introduced in the mid-90s, many industry analysts, service providers and vendors expected it would be the future technology of choice for both carrier and enterprise telephony services. TDMoIP uses considerably less bandwidth than an equivalent VoIP based solution. This feature ensures that voice is compressed and decompressed only once, at the terminating TDMoIP (CV) gateways, avoiding voice degradation or delay when calls are routed through several TDMoIP (CV) gateways. 1002cs voice, wireless, VoIP, telephony, PDA, connectivity, packets, network, sound, Pocket, capability. "Wi-Fi" wireless data links and increasingly powerful PDA devices are triggering a new phase of growth in Internet telephony by bringing real-time connectivity to portable, instanton devices. With delivery of Voice-over-IP (VoIP) services on portable computing devices, enterprise users can now take an important step in fulfilling the promise of converged data and voice services. Cutting the cord that tethers mobile professionals to desktop voice and data applications promises tremendous gains in efficiency. These problems are accentuated in a wireless network. In addition, when a caller is roaming between hot spots (typical user behavior in an enterprise), the hand-over of a call to the next available network node causes delayed and lost packets. voip_aug30_2004> VoIP, regulatory, CompTel/ASCENT, competition, European, market, European incumbents, providers, facilities, adoption, telecommunications. CompTel/ASCENT members share a common objective: to create and sustain true competition in the telecommunications industry, both domestically and internationally. With the development of liberalized regulatory regimes and competitive market conditions in a growing number of countries, many of CompTel/ASCENT members have made significant investments in telecommunications facilities and services in Europe. CompTel/ASCENT is pleased that the European Commission ("EC") is engaged in further efforts to clarify the EU regulatory framework applicable to VoIP. The VATM addresses many issues that also are of concern to CompTel/ASCENT's members: For instance, while National Regulatory Agencies ("NRA") should use caution to regulate VoIP services, regulatory restraint in the VoIP sector is not justified vis-à-vis the European incumbents if the effect of this regulatory restraint would be to limit competition and boost the potential for market-dominating companies to transfer their market power into the VoIP sector. Research Findings Report2 protocol, RFC, VoIP, signaling, algorithm, SIP, testing algorithms, voice, codec, session, media. The RFCs researched include the foundation of VoIP, which is the Internet Protocol (IP), VoIP signaling protocols, and a VoIP media protocol. Session Initiation Protocol (SIP) is a new protocol used for signaling in VoIP. SIP supports: user location, user availability, user capabilities, session setup, and session management. The Session Description Protocol (SDP) is a protocol used to transfer media setup information about a multi-media client from a point to another point. VoIP has two foundations, one being the analog sound that comes from a human's voice, and the Internet Protocol. Codec G.711 is described in the ITU -- T G-series Recommendation G.711. One defines a comfort payload for G.711 and the other provides a low-complexity algorithm for packet loss concealment. Abeyance_Letter_on_VoIPhttp://www.alliancecm.org/uploaded_docs/Abeyance_Letter_on_VoIP.pdf VoIP, local government, proceeding, Commission, pending, docket, communications, petition, Counsel, Miller, request. Services Are Exempt From Access Charges, WC Docket No. 02-361 (filed October 18, 2002); In re Petition for Declaratory Ruling That Pulver.coms Free World Dialup Is Neither Telecommunications Nor a Telecommunications Service, WC Docket No. 03-45 (filed February 5, 2003); In the Matter of Vonage Holdings Corporation Petition for Declaratory Ruling Concerning an Order of the Minnesota Public Utilities Commission, WC Docket No. 03-211 (filed September 22, 2003); In re BellSouth's Request for Declaratory Ruling that State Commissions May Not Regulate Broadband Internet Access Services by Requiring BellSouth to Provide Such Services to CLEC Voice Customers, WC Docket No. 03-251 (filed December 9, 2003); In re Petition of Level 3 for Forbearance from Assessment of Access Charges on Voice-Embedded IP Communications, WC Docket No. 03-266 (filed December 23, 2003) (collectively, "Pending Proceedings"). In the alternative, Local Government requests that these matters be consolidated with the VoIP Proceeding. article0033 network, voice, internet, communications, VoIP, control, endpoints, packet, signaling, protocol, gateway. This revolution, brought about by the explosive growth of the Internet, is driving a major shift in the spending of the infrastructure dollar towards high-speed packet technologies. It has also made it apparent that the days of shoehorning data onto the voice network are ending and that it is time to start adapting voice traffic to the Internet. Due to its latency and, non-deterministic aspect, an IP or IPX network over Ethernet, Fast Ethernet or token ring is considered to constitute such a network. H.323 recommendation uses the following protocols and recommendations: RTP: (Real-time Transport Protocol) provides end-to-end delivery services of real-time audio and video. VoIP12-05-03 CTX, features, Caller, IPT users, intercom, VoIP, Review, phones, Hybrid, phone support team, Review feature spreadsheet. DID vs. Hybrid- We discussed the "Hybrid" scenario's and came to the eventual conclusion that what we're really looking for may be a service called "B-channel intercom", which Kevin believes is a tariffed service. This setup would give us intercom capability between Centrex users and IPT users, while also delivering calls from the PSTN via DID PRI's terminated directly into the VoIP system. Callers from CTX would continue dialing as they do today, while IPT users would migrate to 7 digits. Since the VoIP gear can offer all these same features to IPT users, we really don't need this functionality from CTX. Echo- see above Caller ID- Caller ID is being sent to "land lines" and 636-8000 to pagers, but cell phones receive "unknown number". 04.a.voiphttp://www.ntca.org/content_documents/04.a.voip.pdf VoIP, providers, telecommunications, technologies, NTCA, universal service, emerging technologies, carriers, America, charges, regulatory. VoIP, or voice over Internet protocol is an exciting new technology from the perspective of consumers and telecommunications providers alike. Indeed, just as they have with earlier emerging technologies, NTCA members are aggressively embracing VoIP. For nearly a decade, policymakers and others have engaged in the relentless pursuit of a competitive deregulatory telecommunications environment. While NTCA members have in many ways vigorously embraced these concepts, they concurrently have expressed concern over their potential to undermine the nation's longstanding commitment to universal service. Specifically, NTCA believes: The enhanced service provider (ESP) exemption for Internet service providers should be eliminated as the reasons leading to its creation have longsince dematerialized. sj-060401> SoftJoys Labs, client, Windows, voice, Microsoft Windows, VoIP products, Internet, Gatekeeper, gateway, protocol set, ITU-T. Solon, OH -- June 5, 2001 -- (Business Wire) SoftJoys Labs today announced successful porting of its own implementation of ITU-T H.323 version 3 protocol set into the Windows(TM) CE(TM) 3.0 environment. SoftJoys' Windows CE client software is an H.323 Terminal, which provides two-way voice communications with any other H.323 Terminal or Gateway. CE Client users can place a call over the Internet or (using gateway) to/from PSTN. Win32 Client, Gatekeeper for MS Windows NT/2000 and for UNIX is available as well. "We are very excited about the number of opportunities H.323 CE Client explores," stated Edward Gurary, VP of Marketing and Business Development of SoftJoys, Inc. "With this technology, PDA and other CE device makers can include VoIP capabilities embedded in their products. Its customers include many of the leading names in the telephony and communications markets. | ||
