Its overlay area code is the 289 area code. It was introduced to the public in the middle of 2001. The first Mississauga (Malton) area code was all used up in the later months of 2005, thus the 289 area code will become the area code of phone numbers that will be given starting from that time onwards.
Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate a private branch exchange (PBX) system.
Dialing Instructions Campus, Local, & Long Distance Dialing. The RIT telephone system provides direct inward dialing, direct outward dialing and dialing among telephones within the system. Callers have several options to connect with faculty, staff and students. From off campus, they can either dial the person's direct number.