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This seems a lot like OpenVBX[0] just powered by Plivo, not Twilio[1]. OpenVBX is also open source.

Seems like OpenVBX is a call router of sorts, whereas Opencall is call tracking software. Similar, but different.

so, this is a subset of openVBX?

yup - what is the main difference between the two? OpenVBX can be decoupled from Twilio as well.