VOIP networks don’t have to use traditional phone numbers.
VOIP clients, or extensions, can be located using addresses similar to email. A SIP URI is an identifier for an extension on a telephone system for receiving calls through VOIP without using the traditional telephone system (PSTN). The SIP URI for the Cinci2600 Conf is
iNum is a is a world-wide calling network. You can think of it as a global area code. Many VOIP networks and mobile carriers support iNum calling. If you are interested in iNum, you can call the Cinci2600 Conf via iNum at (883)510009903456.