No, however, the MIT Webex offering does provide international callback. A user can join the web or mobile Webex session and have the system call them at an international number, using the "Call Me" feature in the audio connection settings.
MIT has a direct peering with the Webex network with physical connections to the Webex data centers in New York City and Virginia. Calls placed to and from Webex are made through MIT's Telephony infrastructure here on campus. This allowed us to provide low cost dial in and dial out services for all MIT Webex users, and allowed us to offer Webex to the entire MIT community at no cost, as we had predictable fixed costs with our direct connections.
In order to offer international and other dial in options, MIT would have to procure those services directly in other countries and connect it with our infrastructure and that would be not something we could easily manage and the costs implications could make the service sufficiently expensive to impact our community offering.