As of Summer of 2020, all phones have transitioned from Sylantro to Broadsoft: Transition to MITvoip BroadSoft Cloud
To forward your phone to another number using the BroadSoft system, please follow these instructions:
http://kb.mit.edu/confluence/display/istcontrib/Forwarding+All+Calls+to+a+Personal+Line+%28Home+or+Cell+Phone%29
MIT IST manages the VOIP system. If you have any further issues or need assistance please contact them at: servicedesk@mit.edu or 617-253-1101.
Other helpful phone topics that might be interesting to you: