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Session Initiated Protocol (SIP) Trunks

SIP Trunking will enable the support IP-PBXs that do not have a digital interface (such as PRI). It will also enable the elimination of an IAD, reducing the cost of customer acquisition by several hundred to several thousand dollars, depending on how many trunks they need.

There are several advantages to SIP trunking from the customer’s perspective. First, for newer IP PBXs, they do not need to go to the expense equipping the PBX with a PRI card (many newer models and open source PBXs do not have the ability for any interface except SIP). Second, if the business is multi-site, they can deploy a single IP PBX to support all the remote locations of the enterprise, standardizing the user experience, reducing equipment (and associated maintenance), and reducing LD and trunking costs. In addition, intra-enterprise calls are on-net, eliminating toll charges between sites.

In order to enable SIP Trunking, akabis will need to certify specific makes and models of IP PBXs, and design a CPE interface that creates a demarcation between the customer and the akabis network. Some candidate IP PBXs that will be targeted for SIP Trunking are:

  • Allworx
  • Adrtran
  • Asterisk
  • Avaya
  • Barracuda
  • Cisco
  • Digium
  • Freeswitch
  • LG Ericsson
  • Mitel
  • NEC
  • Panasonic
  • Shoretel
  • Siemens
  • Toshiba


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