Twilio

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**Api**
- Added `announcement` event to conference status callback events
- Removed optional property `time_limit` in the call create request. **(breaking change)**

**Messaging**
- Add rate_limits field to Messaging Services US App To Person API
- Add usecase field in Service API for fetch, create, update, read
- Add us app to person api and us app to person usecase api as dependents in service
- Add us_app_to_person_registered field in service api for fetch, read, create, update
- Add us app to person api
- Add us app to person usecase api
- Add A2P external campaign api
- Add Usecases API

**Supersim**
- Add Create endpoint to Sims resource

**Verify**
- The `Binding` field is now returned when creating a `Factor`. This value won't be returned for other endpoints.

**Video**
- [Rooms] max_concurrent_published_tracks has got GA maturity

**Twiml**
- Add `announcement` event to `statusCallbackEvent` for `<Conference>`.

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**Api**
- Added optional parameter `CallToken` for create calls api
- Add optional property `time_limit` in the call create request.

**Bulkexports**
- adding two new fields with job api queue_position and estimated_completion_time

**Events**
- Add new endpoints to manage subscribed_events in subscriptions

**Numbers**
- Remove feature flags for RegulatoryCompliance endpoints

**Supersim**
- Add SmsCommands resource
- Add fields `SmsCommandsUrl`, `SmsCommandsMethod` and `SmsCommandsEnabled` to a Fleet resource

**Taskrouter**
- Add `If-Match` Header based on ETag for Task Update
- Add `ETag` as Response Headers to Tasks and Reservations

**Video**
- Recording rule beta flag **(breaking change)**
- [Rooms] Add RecordingRules param to Rooms

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**Library - Chore**
- [PR 563](https://github.com/twilio/twilio-python/pull/563): Add support for python 3.9. Thanks to [tim-schilling](https://github.com/tim-schilling)!

**Events**
- Set maturity to beta

**Messaging**
- Adjust A2P brand registration status enum **(breaking change)**

**Studio**
- Remove internal safeguards for Studio V2 API usage now that it's GA

**Verify**
- Add support for creating and verifying totp factors. Support for totp factors is behind the `api.verify.totp` beta feature.

**Twiml**
- Add support for `<VirtualAgent>` noun

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**Library - Chore**
- [PR 561](https://github.com/twilio/twilio-python/pull/561): removed file exec to get version. Thanks to [shwetha-manvinkurke](https://github.com/shwetha-manvinkurke)!

**Events**
- Update description of types in the create sink resource

**Messaging**
- Add WA template header and footer
- Remove A2P campaign and use cases API **(breaking change)**
- Add number_registration_status field to read and fetch campaign responses

**Trusthub**
- Make all resources public

**Verify**
- Verify List Attempts API endpoints added.

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**Library - Docs**
- [PR 553](https://github.com/twilio/twilio-python/pull/553): fix simple typo, ommited -> omitted. Thanks to [timgates42](https://github.com/timgates42)!

**Library - Fix**
- [PR 558](https://github.com/twilio/twilio-python/pull/558): shortcut syntax for new non-GA versions. Thanks to [eshanholtz](https://github.com/eshanholtz)!

**Api**
- Revert change that conference participant create `from` and `to` param to be endpoint type for supporting client identifier and sip address
- Update the conference participant create `from` and `to` param to be endpoint type for supporting client identifier and sip address

**Events**
- Documentation should state that no fields are PII

**Flex**
- Adding `notifications` and `markdown` to Flex Configuration

**Messaging**
- Add A2P use cases API
- Add Brand Registrations API
- Add Campaigns API

**Serverless**
- Add runtime field to Build response and as an optional parameter to the Build create endpoint.
- Add twilio/runtime-handler dependency to Build response example.

**Sync**
- Remove If-Match header for Document **(breaking change)**

**Twiml**
- Add `refer_url` and `refer_method` to `Dial`.

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**Studio**
- Studio V2 API is now GA

**Supersim**
- Allow updating `CommandsUrl` and `CommandsMethod` on a Fleet

**Twiml**
- Add `status_callback` and `status_callback_method` to `Stream`.