You may have a PBX system issue. People who use phones in an office that has extension numbers may experience difficulty as a result of 711 not being programmed in the building’s PBX system. To request the availability of 711 service in your building, contact your IT specialist, office administrator, or local telephone service provider. 711 dialing was mandated by the FCC on October 1, 2001. If you have difficulty dialing 711, please click here and let us know and we will attempt to help get the issue resolved.