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• VoIP softswitch

  DUAL Softswitch is a complete Voice over IP switching and billing solution.  Flat monthly rate.

  Web control panels; Least Cost Routing; Excel tariff uploads; SIP and H323 support.

  H323 SIP softswitch >>

• VoIP calling

  VoIP services for call shops, businesses and home users.   Powerful reseller control panel.

  Choose from three tariffs, depending on your pricing / quality priorities.

  DUAL Talk >>

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  Our lowest rates for wholesale carriers with their own VoIP switch.

  44Mobile >>

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  Our new service designed specifically for Call Shop SIP termination.

  Call shop VoIP >>

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  Make cheaper calls from your mobile phone using SIP and fring.

  fring-a-ling >>

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  UK direct route with CLI.

  44Direct >>

"So how do you calculate the number of lines needed on a CT system?"

"A company I discovered recently, Westbay Engineers Ltd. ... has a great resource for this on their Website - http://www.erlang.com/. They host a free java on-line traffic calculator for Erlang B calculations that provides results for up to 180 phone lines. What's more, for [139 US Dollars], you can download a Windows-based calculator for your PC or Laptop that does Erlang B, Extended Erlang B and Erlang C calculations."

"...Their product definitely beats the heck out of lugging around your Erlang tables. Check out the screenshots. They give you an idea of how easy the calculator is to use. Again, I recommend the product highly."