You can send an invitation to EVA using any of these conferencing providers:
Skype For Business
Simply add EVA@voicera.com as a participant in the "cc" for any of the conference providers listed above, or authorize your calendar to do and EVA will join and meetings with a dial-in and more than 1 person.
In the event there is a problem where EVA is unable to dial-in, you will get an email asking for specific information to try and help EVA figure it out. EVA will use that information to learn the standard format that you use to dial-in.