vb.net barcode generator Past, Present, and Future of Softswitch in Software

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Past, Present, and Future of Softswitch
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Figure 14-12 Softswitch in wireless networks under Reference Architecture (Source: ISC)
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PSE MSC Server HSS AS GMSC Server
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SIGTRAN Signaling: BSSAP or RANAP over M3UA/SCTP H.248 E1/T1/ATM: Signaling + Media
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Signaling Gateway
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RAN AG: Media Gateway
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PSTN/ PLMN RTP
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media from the RAN is terminated on the AG, transcoded and transported to the TG as RTP packets.
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Wireless (3GPP R2000 General Case all IP)
This example shows how the wireless 3G packet network connects to the PSTN or PLMN via the VoIP network (see Figure 14-13). The SGSN/GGSN passes the signaling (BSSAP in GPRS or RANAP in 3G) from the RAN over IP to the Multimedia Server Call Server/Application Server (MMCS/ MMAS), which provides the same functionality as an MSC Server. The MGC carries out signaling with the PSTN or legacy PLMN via the SG. The media from the RAN is passed through the SGSN/GGSN to the MG as RTP packets.
WCDMA Mobile Network
This example shows a total WCDMA network architecture in the circuitswitched domain, with reference to 3GPP, where an IP-based core network
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Past, Present, and Future of Softswitch
Past, Present, and Future of Softswitch
3rd Party Application Server
Figure 14-13 Softswitch in 3G wireless networks under Reference Architecture (Source: ISC)
Non SIP
PSE MMCS/MMAS HSS MGC SIGTRAN Signaling: BSSAP or RANAP over M3UA/SCTP
SIP, H.248
IP: Signaling + Media
RAN SGSN/GGSN
IP Network Media Gateway
PSTN/ PLMN Non IP RTP
Note: The Access Gateway here is referred to as Media Gateway (MG) and can be in the terminal (SIP mobiles) or at the Radio Node Controllers.
is used (see Figure 14-14). This situation is similar to the Wireless R99 example above, but includes more complete protocols. In addition, it shows how an MS, controlled by the MSC Server, can provide simple announcements and under the control of an Application Server that delivers valueadded services, such as voice messaging, push-to-talk, and conferencing.
Conclusion
This chapter explored the history, the present, and the future of softswitch. Far too many softswitch success stories exist to be contained in one book. The chief prognosticator for softswitch over the next two years will be how ubiquitous softswitch becomes as a long-distance solution and, most importantly, how widespread softswitch, in whatever form, takes traffic away from Class 5 switches.
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Past, Present, and Future of Softswitch
Figure 14-14 Reference Architecture for 3GPP networks on an IP network (Source: ISC)
VLR MAP Signaling SIGTRAN (M3UA/SCTP) Signaling Open APIs Application Server Third Party Service OSA SIP SIP/SIP-T, H.323 Q.BICC MSC Server SIP, H.248 GMSC Server MAP Signaling SIGTRAN (M3UA/SCTP) HLR OSA
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Open APIs
Open APIs OSA Application Server Third Party Service
Signaling
SIP Signaling Conversion SIGTRAN (M3UA/SCTP)
Signaling Conversion
Media Gateway Control SIGTRAN (M3UA/SCTP)
H.248 Media Server Media Gateway Control
Signaling Gateway
SS7/BICC ISUP CAP
PSTN Signaling
Media RTP/RTCP BSSAP RANAP ATM SS7 RAN TDM Media & Signaling Gateways
H.248
SS7/BICC PSTN/PLMN
IP Network
TDM/ATM
Media Gateway
The growing number of success stories in the industry coupled with reference architecture, protocols, and standards will assuage fears of service providers contemplating a move to softswitch technology. Eventually, a critical mass will be reached and softswitch will replace both Class 4 and 5 switches.
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Source: Softswitch Architecture for VoIP
CHAPTER
Conclusion: Softswitch Will Conquer the World
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Conclusion: Softswitch Will Conquer the World
15
Although this book has focused on comparing softswitch solutions to legacy Class 4, Class 5, and private branch exchange (PBX) architectures, the reality is that softswitch solutions are something entirely new and should not be compared to legacy systems on a port-for-port or feature-by-feature basis. The brave new world of telecommunications is based on the Internet Protocol (IP) and offers voice as one of a multitude of services. The telecommunications infrastructure in developed economies will evolve from legacy to converging to converged networks. Capitalism dictates that entirely new infrastructures will rise to compete with legacy architectures for a share of the multibillion dollar international telecommunications market. Given that softswitch solutions are cheaper, smaller, simpler, and more convenient to use, they will be the platforms of choice in gaining those market shares. This book, in addition to providing an overview of the progression from legacy to converged networks, has addressed the chief objections to softswitch and Voice over IP (VoIP) technologies that center on scalability, reliability, quality of service (QoS), signaling, and features. Despite the fact that softswitch technologies are entirely new, it is necessary to describe softswitch in comparison to legacy Time Division Multiplexing (TDM) architectures. Like any other technical issue(s), no problems exist, only solutions that a talented engineering team can build into their network. Unlike legacy telephone networks, softswitch offers a modularity of interoperable components that enable service providers to mix and match to build a network that meets their goals. Table 15-1 details a comparison of Class 4 switches and softswitch products that replace them.
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