vb.net barcode generator The Big So What about SIP in Software

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The Big So What about SIP
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SIP offers some immediate impact on the telecommunications industry. Given its simlicity and ease of use, it has aleady found a numer of applications that could catapault its use into the mainstream in just a few years.
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SIP on Windows XP
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In March 2001, Microsoft announced that its new version of Windows, Windows XP, would contain SIP. This has immense implications. If every PC running Windows XP is an SIP UA, then every one of those computers is potentially a telephone and is at least somewhat independent of the PSTN. This would be especially true of PCs on corporate WANs where PC-to-PC calls would become the norm rather than the exception. For users with anthropological barriers to using a PC as a phone, very inexpensive handsets are available that interface the PC to the user. Microsoft projects upwards of 245 million XP users by the end of 2002. If, eventually, all 245 million XP users shifted at least some of their telephony
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usage to their PC via Windows XP SIP applications, there would be some significant loss of traffic to the legacy telephone companies. No telephone company in the world has 245 million subscribers. What if Windows XP SIP becomes to telephony what Microsoft Word has become to word processing
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Microsoft, by developing and distributing Windows XP with SIP, has facilitated some deconstruction of the telecom industry as we know it. To make an SIP call via Windows XP, the user gains access to the Internet (potentially via Microsoft Network, Microsoft s ISP) or their IP corporate WAN. It should be noted here that the MSN ISP has some 5 million subscribers. With the acquisition of a few large U.S. ISPs, Microsoft Network could be one of the largest if not the largest ISP in the United States. Using their account with one of the partner IP telephony service providers (Net2Phone, DialPad, or Delta3), users can place a call to any phone in the world. WorldCom plans to offer VoIP services to XP users in the enterprise market. In the United Kingdom, Callserve Communications plans to do the same in the residential market. In Canada, Microsoft has partnered with Telus, offering voice-over-Internet services to high-speed subscribers. Referring back to the PSTN model comprised of access, switching, and transport, Microsoft assumes the position of providing access to the voice network. Specifically, the Windows-XP-powered PC potentially replaces the handset; assuming the subscriber is using Microsoft Network as its ISP, Microsoft is the de facto local loop. Switching is provided by the IP telephony carriers (DialPad, Net2Phone, and so on) and transport is via an IP backbone service provider (Level3 or Cable and Wireless).21 As a result, the central office is potentially replaced. The specific agent in Windows XP that contains the SIP package is Windows Messenger. To deliver Internet telephony to the Windows user, Windows Messenger offers three broad technological improvements. First, it significantly reduces voice delay, the chief quality issue with VoIP, to a min-
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21 Arnold, Jon. Where Does Microsoft Want To Go Today Sounding Board Magazine, December 2001. www.soundingboardmag.com/articles/1c1sb.html.
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SIP: Alternative Softswitch Architecture
SIP: Alternative Softswitch Architecture
imum of about 70 milliseconds. When communicating clients are on one well-engineered LAN, this delay is not noticeable. When clients communicate over the Internet, there is substantial headroom (at least 80 milliseconds) before delays begin to interfere with conversational dynamics. Second, Windows XP comes with a variety of voice codecs that Windows Messenger uses. When network conditions favor wide bandwidth and low delay, these make voice sound significantly better than telephone quality. When network throughput degrades or delay increases, coders are able to gracefully fall back to lower bit rates. When network congestion eases again, coders dynamically step up to higher quality. This happens automatically, under application control. Third, Windows Messenger includes acoustic echo cancellation software, which reduces echo and eliminates the need for a headset in average-sized offices. Windows Messenger doesn t solve Internet delay or reachability problems, but it appears at the right time. Today the Internet is significantly faster than it was five or six years ago. Many, many more people have PCs. Increasingly, these PCs are always on. In the ideal workplace, these PCs are usually connected to the Internet via 100 Mbps Ethernet. At home, residential always-on connections (DSL, cable, and wireless) are becoming more and more prevalent. Increasingly, PCs can place IP phone calls to any other phone in the world using gateway providers, as mentioned previously.22 This product may find a very fertile market outside the United States, particularly in nations where even local calls (which is most of the world outside the United States) are billed by the minute and it takes years to get a landline phone installed (assuming alternatives to the last mile). Assuming a similar proportion of long-distance business worldwide is comparable to the 70 percent figure in the United States, non-U.S. businesses will want to move their interoffice phone traffic, both local and long distance, on to their corporate WAN courtesy of the SIP package contained in Windows XP. For many in the developing world, Internet access is gained at a local cyber caf . PCs in those cyber caf s could be configured to perform as telephones. This will have the effect of introducing competition to the local loop in those countries.
Isenberg, David. Windows Messenger: New Waves of Innovation. A white paper for Microsoft, www.microsoft.com/windowsxp/pro/techinfo/planning/networking/windowsmessenger.asp.
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