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What are SIP Trunks?

By: C. Oppenheimer

SIP trunking is a method of providing VoIP telephony to your business. A SIP trunk is a direct line from the IP phone, to your business' IP PBX, to the telephone service provider.

How it works is that the telephone provider offers as many SIP lines as you request. For example, if you have four IP phones in your business, you might request four SIP lines to the service provider.

These SIP trunks are similar to how an analog line is provided by the telephone service. Except instead of four physical lines being installed in your business (to use our previous example of four phones), four virtual lines are provisioned for your network's use.

The medium that the SIP trunks use to travel between your IP PBX and telephone service provider is the Internet. This method is perfect as a cost-effective means of telecommunications for businesses looking for an alternative to a hosted VoIP provider.

Your on-premise IP PBX can outfit these lines with a full range of advanced VoIP features. The SIP trunks are merely a direct means of connecting to the telephone service provider. The SIP trunk can support a range of features beyond voice, including video, multimedia and messaging.

SIP trunks are also incredibly easy to scale. Request additional SIP trunks to support more telephony devices, or provision a remote location with SIP trunks as a cheaper means of long-distance calling.