Businesses are gradually migrating to IP-based platforms and solutions. Frost & Sullivan’s research shows that most businesses that have not yet deployed IP telephony plan to do so in the next few years. But not everyone is ready to make the move. And practically no business is willing to forklift its entire existing infrastructure overnight.
The major holdbacks in IP telephony and UC adoption are typically related to concerns over how to protect existing, unamortized assets and ensure continuity when migrating to new communications architectures. Therefore, most businesses are cautious in their implementation of VoIP and IP telephony and are only gradually migrating individual platforms and sites, thus creating “islands” of IP technologies within the company’s communications environment. SIP trunking helps bridge these islands.
VoIP access and SIP trunking services involve the provision of integrated circuits using VoIP or SIP technologies to enterprises that have implemented premises-based enterprise telephony solutions (Private Branch Exchanges (PBXs)/IP PBXs or key systems). In a VoIP access or SIP trunking scenario, the service provider typically offers local dial tone, long-distance calling, and a limited set of call-management and control features such as extension dialing to intra- and inter-office locations.
VoIP access and SIP trunking services essentially direct enterprise customers toward a path of gradual transition to fully converged, IP-based networks. They allow businesses to enjoy the benefits of IP telephony while eliminating the need to forklift-upgrade their networks. VoIP access services interfacing with a legacy TDM system do require the deployment of a voice gateway at the enterprise premises, whereas SIP trunking services are typically deployed with SIP-based or SIP-enabled enterprise telephony platforms where protocol conversion is not required. Session border controllers (SBCs) may, however, be needed for protocol normalization and security purposes. Typically, VoIP access and SIP trunking services allow enterprises to continue to utilize their existing handsets as well as other TDM voice customer premises equipment (CPE) thereby preventing significant upfront investments.
Increasingly, service providers are bundling VoIP access and SIP trunking services with various network-based communications applications and capabilities, such as hosted auto attendant, voicemail, unified messaging, mobility/FMC or some data services including web hosting, web email, managed security, and so on.
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