It would be very useful to have a telephone call-in feature for group calls (similar to google hangouts or zoom) so that there can be a three-way call and no everyone has to be using a browser. This might reduce issues caused by unstable internet. It would greatly facilitate the use of interpreters, especially when there is limited access to technology and internet.
+1 for having a phone number.
I think Doxy.me could add a phone number for paid customers-- we have a clinic subscription, and it would be great to have a phone number for people to dial into.
Each clinic subscription could get a phone # associated with it, and each URL could have an invite code associated with it.