Meet The 2600hz Project, The New Sound of Open Source Telephony
2600 Hz is the frequency that the phone companies used back in the day and was hacked by those seeking to make free long distance phone calls. In order to do so, one needed a device that generated the 2600 Hz tone, called the blue box. The new venture is an homage to that heritage.
From what I understand, the new company was formed after some disagreements between the FreePBX developers and the original backers of the project. FreePBX is a graphical user interface that sits on top of open-source telephony software such as Asterisk. FreePBX was promoted by Bandwidth.com.

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