| R | Twilio.Types.Alpha |
| rateCenter | Twilio.AvailablePhoneNumber |
| readSID | Twilio.Types.SID |
| Received | Twilio.Message |
| record | Twilio.Calls |
| Recording | |
| 1 (Type/Class) | Twilio.Recording |
| 2 (Data Constructor) | Twilio.Recording |
| recordingList | Twilio.Recordings |
| Recordings | |
| 1 (Type/Class) | Twilio.Recordings |
| 2 (Data Constructor) | Twilio.Recordings |
| RecordingSID | |
| 1 (Type/Class) | Twilio.Types.SIDs, Twilio.Types, Twilio |
| 2 (Data Constructor) | Twilio.Types.SIDs, Twilio.Types, Twilio |
| recordingSID | Twilio.Transcription |
| recordingsPagingInformation | Twilio.Recordings |
| recurring | Twilio.UsageTrigger |
| region | |
| 1 (Function) | Twilio.AvailablePhoneNumber |
| 2 (Function) | Twilio.Address |
| request | Twilio.Internal.Request |
| RequestF | |
| 1 (Type/Class) | Twilio.Internal.Request |
| 2 (Data Constructor) | Twilio.Internal.Request |
| RequestT | |
| 1 (Type/Class) | Twilio.Internal.Request |
| 2 (Data Constructor) | Twilio.Internal.Request |
| Ringing | Twilio.Call |
| RO | Twilio.Types.ISOCountryCode, Twilio.Types, Twilio |
| runRequest' | Twilio.Internal.Request |
| runRequestT | Twilio.Internal.Request |
| runTwilio | Control.Monad.Twilio, Twilio |
| runTwilio' | Control.Monad.Twilio, Twilio |
| runTwilioT | Control.Monad.Twilio, Twilio |
| runTwilioT' | Control.Monad.Twilio, Twilio |