Back in the days of wireline telephony, when all phone calls went over the Public Switched Telephony Network (PSTN), businesses would purchase “trunks” – dedicated lines or a bundle of circuits – from their service provider.

Today the new model of “trunking” to IP-enabled enterprises can result in lower telephony costs and a rapid Return On Investment (ROI) plus the opportunity for enhanced communications within the enterprise as well as with vendors, customers and partners.

The possibility for a rapid return on investment is a key driver of SIP trunk deployments.

SIP trunking delivers the following benefits:

• Eliminates costly BRIs (Basic Rate Interfaces) and PRIs (Primary Rate Interfaces) services
• Removes the need to invest in additional PSTN gateway capacity as you grow
• Reduces capital expenditures: edge devices offer a lower investment path in adding new lines as they are typically cheaper per line than the corresponding PSTN gateway
• Optimizes bandwidth utilization by delivering both data and voice via the same connection
• Maximizes flexibility in dimensioning and usage of lines as you avoid having to buy capacity in chunks of 23 (T1) or 30 (E1) lines
• Provides flexible termination of calls to preferred providers; calls to anywhere worldwide can be made for the cost of a local call
• Enables redundancy with multiple service providers and links

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