§  9.1   Purpose.

   The purpose of this part is to set forth the 911 and E911 service
   requirements and conditions applicable to telecommunications carriers
   (subpart B); commercial mobile radio service (CMRS) providers (subpart
   C); interconnected Voice over Internet Protocol (VoIP) providers
   (subpart D); providers of telecommunications relay services (TRS) for
   persons with disabilities (subpart E); multi-line telephone systems
   (MLTS) (subpart F); and Mobile-Satellite Service (MSS) providers
   (subpart G). The rules in this part also include requirements to help
   ensure the resiliency, redundancy, and reliability of communications
   systems, particularly 911 and E911 networks and/or systems (subpart H).