vb.net barcode generator Call control service comparison H.323 to SIP in Software

Encoding QR Code in Software Call control service comparison H.323 to SIP

Table 5-5 Call control service comparison H.323 to SIP
QR Code JIS X 0510 Scanner In None
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Criteria Complexity Message set Debugging Extensibility User extendable Elements that must maintain states Processor usage Telephony features Host application Code size Dynamic memory usage
QR-Code Reader In None
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H.323 Very complex Many messages Have to alter tools when a protocol is extended Extensible ASN.1 complex Clients, gatekeepers, MCU, gateways, UAs, some proxy servers More overhead Robust Very complex Large Large
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Print QR Code JIS X 0510 In .NET
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SIP Simple Few messages Simple tools Very extensible Text based easy
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Paint Code 3/9 In None
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Less overhead Robust Much simpler Small Small to medium
Data Matrix ECC200 Creation In None
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Code128 Creator In None
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Ibid.
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EAN / UCC - 13 Printer In None
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EAN - 14 Maker In None
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Print Code 3/9 In .NET Framework
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SIP: Alternative Softswitch Architecture
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Barcode Reader In .NET
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Services
GS1-128 Encoder In Objective-C
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5
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Scanning Bar Code In VB.NET
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What makes SIP and softswitch architectures so revolutionary is the ease with which they offer services and features. At the minimum, SIP supports personal mobility via its use of registration such that a corporate user can move his or her SIP phone anywhere on the corporate LAN or WAN, and the network will instantly know where to route that user s calls. Onenumber service is made possible by SIP forking proxies. SIP messages carry Multipurpose Internet Mail Extension (MIME) content in addition to an SDP description. A response to an INVITE message could include a piece of text, an HTML document, an image, and so on. As an SIP address, a URL can be included in web content for click-to-call applications. SIP was designed for IP-based applications and can leverage those applications to create new telephony-oriented services.19 Almost as exciting as new services is the fact that SIP can be used to implement existing Custom Local Area Signaling Service (CLASS) services found in the PSTN (for example call forwarding, conferencing, caller ID, and so on). One significant objection service providers have had about VoIP and softswitch is the notion that softswitch architectures did not replicate the legendary 3,500 features that came with the 5ESS CLASS 5 switch. Given the flexibility of SIP and voice XML (VXML) software, those 3,500 features, in theory, can be matched or exceeded. This will be addressed in a later chapter comparing softswitch to CLASS 4 and 5 switches. Signaling for SIP calls is routed via a proxy. This enables the proxy to utilize advanced feature logic. The feature logic may be resident at the proxy or in a separate feature server or database. The proxy may have access to other functions such as the policy server, an authentication server, and so on, each of which may be distributed throughout an IP network or all in one location. For example, the policy server may hold call-routing information or QoS-related information while the feature server holds subscriber information. The SIP proxy server can interface with SS7 signaling at the service control point (SCP) where services are offered via the Intelligent Network Application Part (INAP).20 Interfacing SS7 and IP networks is addressed in a later chapter. Given that SIP is a text-based language, many programmers in the industry are familiar with web applications, text parsers, and scripting languages that contribute to SIP. No special knowledge is necessary to create
19 20
SIP vs. H.323, A Business Analysis. Collins, pg. 207 208.
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SIP: Alternative Softswitch Architecture
SIP: Alternative Softswitch Architecture
an SIP service. Also, any PC can be an SIP server to test new applications. SIP enables programmers familiar with the functional needs of a certain community to create their own services. Gone are the days when a service provider has to wait 18 months from the request to the delivery of a single new feature.
H.323 Versus SIP Conclusion
If SIP is better, why is H.323 important A large, installed base of H.323 equipment exists, and vendors building new VoIP products are concerned about being backwards compatible with existing VoIP equipment and services. Carriers building VoIP networks also want to be able to enable their users to communicate with users on other VoIP networks. This would imply that H.323 is still an important protocol. Based on the technical advantages of SIP, the widespread support of SIP by H.323 vendors, the large number of SIP vendors already in the market, and the nearly universal availability of SIP services from the service providers, there is little argument in favor of continuing to develop H.323-based products.
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