• Subpart A - Subpart A [Reserved]

• Subpart B [§ 64.201 - § 64.201] - Subpart B—Restrictions on Indecent Telephone Message Services

• Subpart C - Subpart C [Reserved]

• Subpart D [§ 64.401 - § 64.402] - Subpart D—Procedures for Handling Priority Services in Emergencies

• Subpart E - Subpart E [Reserved]

• Subpart F [§ 64.601 - § 64.643] - Subpart F—Telecommunications Relay Services and Related Customer Premises Equipment for Persons With Disabilities

• Subpart G [§ 64.702 - § 64.710] - Subpart G—Furnishing of Enhanced Services and Customer-Premises Equipment by Bell Operating Companies; Telephone Operator Services

• Subpart H [§ 64.801 - § 64.804] - Subpart H—Extension of Unsecured Credit for Interstate and Foreign Communications Services to Candidates for Federal Office

• Subpart I [§ 64.901 - § 64.905] - Subpart I—Allocation of Costs

• Subpart J [§ 64.1000 - § 64.1002] - Subpart J—Recovery of Investments and Expenses in Regulated Interstate Rates

• Subpart K [§ 64.1100 - § 64.1195] - Subpart K—Changes in Preferred Telecommunications Service Providers

• Subpart L [§ 64.1200 - § 64.1204] - Subpart L—Restrictions on Telemarketing, Telephone Solicitation, and Facsimile Advertising

• Subpart M [§ 64.1300 - § 64.1340] - Subpart M—Provision of Payphone Service

• Subpart N [§ 64.1401 - § 64.1402] - Subpart N—Expanded Interconnection

• Subpart O [§ 64.1501 - § 64.1515] - Subpart O—Interstate Pay-Per-Call and Other Information Services

• Subpart P [§ 64.1600 - § 64.1606] - Subpart P—Calling Party Telephone Number; Privacy

• Subpart Q [§ 64.1700 - § 64.1704] - Subpart Q—Implementation of Section 273(d)(5) of the Communications Act: Dispute Resolution Regarding Equipment Standards

• Subpart R [§ 64.1801 - § 64.1801] - Subpart R—Geographic Rate Averaging and Rate Integration

• Subpart S [§ 64.1900 - § 64.1900] - Subpart S—Nondominant Interexchange Carrier Certifications Regarding Geographic Rate Averaging and Rate Integration Requirements

• Subpart T [§ 64.1901 - § 64.1903] - Subpart T—Separate Affiliate Requirements for Incumbent Independent Local Exchange Carriers That Provide In-Region, Interstate Domestic Interexchange Services or In-Region International Interexchange Services

• Subpart U [§ 64.2001 - § 64.2011] - Subpart U—Privacy of Customer Information

• Subpart V [§ 64.2101 - § 64.2119] - Subpart V—Rural Call Completion

• Subpart W [§ 64.2201 - § 64.2201] - Subpart W—Ring Signaling Integrity

• Subpart X [§ 64.2301 - § 64.2345] - Subpart X—Subscriber List Information

• Subpart Y [§ 64.2400 - § 64.2401] - Subpart Y—Truth-in-Billing Requirements for Common Carriers; Billing for Unauthorized Charges

• Subpart Z [§ 64.2500 - § 64.2502] - Subpart Z—Prohibition on Exclusive Telecommunications Contracts

• Subpart AA - Subpart AA [Reserved]

• Subpart BB [§ 64.3100 - § 64.3100] - Subpart BB—Restrictions on Unwanted Mobile Service Commercial Messages

• Subpart CC [§ 64.4000 - § 64.4006] - Subpart CC—Customer Account Record Exchange Requirements

• Subpart DD [§ 64.5000 - § 64.5001] - Subpart DD—Prepaid Calling Card Providers

• Subpart EE [§ 64.5101 - § 64.5111] - Subpart EE—TRS Customer Proprietary Network Information.

• Subpart FF [§ 64.6000 - § 64.6140] - Subpart FF—Incarcerated People's Communications Services

• Subpart GG [§ 64.6201 - § 64.6219] - Subpart GG—National Deaf-Blind Equipment Distribution Program

• Subpart HH [§ 64.6300 - § 64.6308] - Subpart HH—Caller ID Authentication

• Subpart II [§ 64.6400 - § 64.6409] - Subpart II—Communications Service Protections for Victims of Domestic Violence, Human Trafficking, and Related Crimes