| CA | Twilio.Types.ISOCountryCode, Twilio.Types, Twilio |
| Call | |
| 1 (Type/Class) | Twilio.Call |
| 2 (Data Constructor) | Twilio.Call |
| callbackMethod | Twilio.UsageTrigger |
| callbackURL | Twilio.UsageTrigger |
| CallDirection | Twilio.Call |
| callerName | Twilio.Call |
| callList | Twilio.Calls |
| Calls | |
| 1 (Type/Class) | Twilio.Calls |
| 2 (Data Constructor) | Twilio.Calls |
| CallSID | Twilio.Types.SID, Twilio.Types, Twilio.Call, Twilio |
| callSID | Twilio.Recording |
| callsPagingInformation | Twilio.Calls |
| CallStatus | Twilio.Call |
| Canceled | Twilio.Call |
| Capabilities | Twilio.Types.Capability, Twilio.Types, Twilio |
| capabilities | |
| 1 (Function) | Twilio.AvailablePhoneNumber |
| 2 (Function) | Twilio.IncomingPhoneNumber |
| Capability | Twilio.Types.Capability, Twilio.Types, Twilio |
| category | Twilio.UsageRecord |
| CH | Twilio.Types.ISOCountryCode, Twilio.Types, Twilio |
| city | Twilio.Address |
| close | Twilio.Account |
| Closed | Twilio.Account |
| companyName | |
| 1 (Function) | Twilio.AuthorizedConnectApp |
| 2 (Function) | Twilio.ConnectApp |
| Completed | |
| 1 (Data Constructor) | Twilio.Call |
| 2 (Data Constructor) | Twilio.Transcription |
| ConnectApp | |
| 1 (Type/Class) | Twilio.ConnectApp |
| 2 (Data Constructor) | Twilio.ConnectApp |
| connectAppList | Twilio.ConnectApps |
| ConnectApps | |
| 1 (Type/Class) | Twilio.ConnectApps |
| 2 (Data Constructor) | Twilio.ConnectApps |
| ConnectAppSID | Twilio.Types.SID, Twilio.Types, Twilio.AuthorizedConnectApp, Twilio.ConnectApp, Twilio |
| connectAppsPagingInformation | Twilio.ConnectApps |
| Continue | Twilio.Calls |
| count | Twilio.UsageRecord |
| countUnit | Twilio.UsageRecord |
| createSubAccount | Twilio.Accounts |
| Credentials | Control.Monad.Twilio, Twilio |
| currentValue | Twilio.UsageTrigger |
| customerName | Twilio.Address |
| CY | Twilio.Types.ISOCountryCode, Twilio.Types, Twilio |
| CZ | Twilio.Types.ISOCountryCode, Twilio.Types, Twilio |