What is a SIP Trunk?

A SIP Trunk is used to make a simultaneous call that is routed over the IP backbone of a carrier using VoIP technology.

  • SIP Trunks are used in conjunction with an IP-PBX and are thought of as replacements for traditional PRI or analog circuits.
  • SIP stands for Session Initiation Protocol.

There are three components necessary to successfully deploy SIP trunks:

  • PBX with a SIP-enabled trunk side,
  • An enterprise edge device understanding SIP
  • Internet telephony or SIP trunking service provider

sip trunking_diagram

SIP Trunking reduces costs by eliminating the need for separate voice and data connections, and expands the potential for communications convergence using both voice and data together. As a company grows, all necessary infrastructure to handle additional voice/data traffic is already in place.

One of the immediate ways SIP trunks reduce communications costs is by eliminating the need to purchase ISDN, BRIs, PRIs or local PSTN gateways.

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