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Signaling gateways are used to terminate signaling links from PSTN networks or other signaling points. The SS7 signaling gateway serves as a protocol mediator (translator) between the PSTN and IP networks. That is, when a call originates in an IP network using H.323 as a VoIP protocol and must terminate in the PSTN, a translation from the H.323 signaling protocol to SS7 is necessary in order to complete the call. Physically, a signaling function can be embedded directly into the MGC or housed within a standalone gateway.
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The application server accommodates the service and feature applications made available to a service provider s customers. Examples include call forwarding, conferencing, voice mail, forward on busy, and so on. Physically, an application server is a server loaded with a software suite that offers the application programs. The softswitch accesses, enables, and applies these application programs to the appropriate subscribers as needed (see Figure 3-2). A softswitch solution emphasizes open standards as opposed to the Class 4 or 5 switch that has historically offered proprietary and closed environments. A carrier was a Nortel shop or a Lucent shop. No components (hardware or software) from one vendor would be compatible with products from another vendor. Any application or feature on a DMS-250, for example, had to be a Nortel product or specifically approved by Nortel. This usually translates into less than competitive pricing for those components. Softswitch open standards are aimed at freeing service providers from vendor dependence and the long and expensive service development cycles of legacy switch manufacturers. Concern as to whether a softswitch solution can transmit a robust feature list identical to that found on a Nortel DMS-250, Class 4 switch, for example, is an objection among service providers. Softswitch offers the advantage of enabling service providers to integrate third-party applications or even write their own while interoperating with the features of the PSTN via SS7. This is potentially the greatest advantage to a service provider presented by softswitch technology. Features reside at the application layer in softswitch architecture. The interface between the call control layer and specific applications is the application program interface (API). Writing and interfacing an application
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Softswitch Architecture or "It's the Architecture, Stupid!"
with the rest of the softswitch architecture occurs in the service creation environment. This will be covered in greater detail in a following chapter.
Applications for Softswitch
Where does a softswitch fit in a next-generation network What does it do How does it compare with PSTN switches The following pages will note how softswitch technologies are deployed to replace TDM switches ranging from PBXs to Class 5 switches. IP PBX Perhaps the earliest application for VoIP was the installation of a VoIP gateway on the trunk side of a PBX. This gateway packetized the voice stream and routed it over an IP network (corporate WAN, UPN, Internet), which saved the business much money in long-distance transport costs. This solution used the existing PBX s set of features (conferencing, call forwarding, and so on). It also provided investment protection to the user by leveraging the legacy PBX into a VoIP solution. The intelligence in this solution was contained in software known as the gatekeeper. The gatekeeper was the precursor to the softswitch. That configuration is detailed in Figure 3-6. Eventually, software developers devised a soft PBX, which could replace legacy PBXs (see Figure 3-8). These soft PBXs were considerably less expensive than a hardware PBX. They then came to be known as IP PBXs. An IP PBX can be thought of as an enterprise-grade softswitch.
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