Twilio

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**Chat**
- Add Channel Webhooks resource

**Monitor**
- Update event filtering to support date/time **(breaking change)**

**Wireless**
- Updated `maturity` to `ga` for all wireless apis

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**Video**
- Redesign API by adding custom `VideoLayout` object. **(breaking change)**

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**Twiml**
- Gather input Enum: remove unnecessary "dtmf speech" value as you can now specify multiple enum values for this parameter and both "dtmf" and "speech" are already available.

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**Library**
- PR 413: Add incoming.allow to AccessToken VoiceGrant. Thanks to ryan-rowland!

**Preview**
- Support for Understand V2 APIs - renames various resources and adds new fields

**Studio**
- Change parameters type from string to object in engagement resource

**Video**
- [Recordings] Change `size` type to `long`. **(breaking change)**

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**Lookups**
- Disable support for `fraud` lookups *(breaking change)*

**Preview**
- Add `BuildDuration` and `ErrorCode` to Understand ModelBuild

**Studio**
- Add new /Context endpoint for step and engagement resources.

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**Api**
- Add `caller_id` param to Outbound Calls API
- Release `trim` recording Outbound Calls API functionality in helper libraries

**Video**
- [composer] Add `room_sid` to Composition resource.

**Twiml**
- Adds support for passing in multiple input type enums when setting `input` on `Gather`