In their end-of Weekend pitch, they said that they were Twilio-based (in the interests of getting this done over the weekend). Over the longer term, they plan

In their end-of Weekend pitch, they said that they were Twilio-based (in the interests of getting this done over the weekend). Over the longer term, they plan to move to Asterisk/trunks if/when call volumes picked up (since Twilio pricing is not very aggressive for long multi-way calls : but the service/pricing is excellent for knocking something together).