Business IP Telephony utilizing SIP Trunks for Voice over IP
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A very recent advancement within IP Telephony communications, SIP Trunks are a highly cost-effective and compelling means of implementing VoIP (Voice over IP) throughout an organization. Operating over IP (Internet Protocol) networks, Session Initiation Protocol (SIP) enables users to originate and receive phone calls. Calling non-SIP subscribers is transparent as SIP services seamlessly bridge the Public Switched Telephone Network (PSTN), often reducing the cost of Long Distance. Furthermore, SIP is also key to achieving Unified Communications, fully supporting voice, video, e-mail and instant messaging (IM) in one network protocol thus enabling application level integration. SIP is also an opportunity to improve business continuity concerning voice systems, by taking full advantage of built in fail over paths within corporate IP networks. SIP Trunk service offers significant cost savings based on using a single network architecture for voice and data, eliminating expensive, underutilized ciruits to the PSTN and fully optimizing the use of IP network bandwidth to lower overall telephony total cost of ownership.
Enterprises, medium and even sometimes smaller businesses predominately operate from multiple locations, relying on multiple basic (BRI) or primary rate interface (PRI) connections to traditional voice services via the PSTN. Additionally, most organizations have placed a "toe in the water", having likely acquired a private branch exchange with IP functionality (iPBX) and perhaps even some "experimental" IP phone sets. Typically, the vast majority of these corporate iPBX systems are under utilized, primarily connecting non-IP phones with PSTN services. While, legacy BRI and PRI channels are leased to individual locations in fixed hardware dependent chunks of twenty-three (23), SIP channels are configured in software, allocated across the entire organization, and dynamically burst, ensuring that the next inbound call is always answered and outbound call completed, making SIP a much more flexible and scalable solution. SIP can viewed as a final piece to the puzzle, enabling end to end Voice over IP communications both within and outside an organization, while eliminating older, less efficient networks, improving overall operations, administration and management.
Implemementations and migrations to SIP trunking offers immediate cost savings with "hard cost" return on investment (ROI) as quickly as six (6) months. With SIP, multi-year term leasing of inflexible and expensive BRI & PRI service is eliminated; you only pay for the software call channels you require, and when you require it, creating many "soft cost" efficiencies including the management of ACD (adds, changes and deletes). Nearly always, SIP traffic (typically a total increase of approximately 1%) can be supported by existing network infrastructures without increasing total bandwidth.

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