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As enterprises struggle to save money and simplify their communications in a difficult economy many are exploring Voice over IP (VoIP) to consolidate their voice and data communications. While consumers have benefited from a dramatic reduction in per-minute voice charges over the last 15 years, enterprises have seen a different story. Fixed infrastructure costs such as Primary Rate Interface (PRI) lines and Public Service Telephone Network (PSTN) gateways often cost $450-$600 each per month, yet many of those lines are underutilized because they force the enterprise to buy more capacity than it needs.

By combining voice and data communications on a single, IP-based network using Session Initiation Protocol (SIP) trunks, enterprises can reduce their telephony costs significantly. Migrating from TDM/PRI trunks to IP-based SIP trunks yields immediate benefits two ways: by eliminating under-utilized PRI lines and reducing expensive PSTN toll charges. It also gives added benefits to the enterprise because IT gains more control over costs, quality and calling services.

Sonus IP-voice networks provide simple, centralized control of dial plans, security policy, and quality of service-even in environments that use multiple brands and generations of PBXs. Aggregating voice traffic onto SIP trunks also gives companies the leverage to bypass long-distance fees for inter-office calls and negotiate better long-distance rates with carriers for "off net" traffic by interconnecting-or peering-with them directly.

By Aashu Virmani, Senior Director - Product and Corporate Marketing, Sonus Networks