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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.
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.
A SIP trunk is a service offered by an Internet Telephony Service Provider (ITSP) that uses SIP to set up communications between an enterprise PBX and the ITSP. A trunk encompasses multiple voice sessions - as many as the enterprise needs. While some see SIP as just voice, SIP trunking can also serve as the starting point for the entire breadth of real-time communications possible with the protocol, including instant messaging, presence applications, whiteboarding or application sharing.
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.
- IP-PBX with a SIP-enabled trunk interface,
- Enterprise edge device that supports SIP
- Internet telephony or SIP trunking service provider (ITSP).
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