Twilio

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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`

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**Api**
- Add `trim` param to Outbound Calls API

**Lookups**
- Add support for `fraud` lookup type

**Numbers**
- Initial Release

**Video**
- [composer] Add `SEQUENCE` value to available layouts, and `trim` and `reuse` params.

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**Api**
- Add `AnnounceUrl` and `AnnounceMethod` params for conference announce

**Chat**
- Add support to looking up user channels by identity in v1

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**Preview**
- Remove Studio Engagement Deletion

**Studio**
- Initial Release

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**Api**
- Add `conference_sid` property on Recordings
- Add proxy and sms usage key

**Chat**
- Make user channels accessible by identity
- Add notifications logs flag parameter

**Fax**
- Added `ttl` parameter
`ttl` is the number of minutes a fax is considered valid.

**Preview**
- Add `call_delay`, `extension`, `verification_code`, and `verification_call_sids`.
- Add `failure_reason` to HostedNumberOrders.
- Add DependentHostedNumberOrders endpoint for AuthorizationDocuments preview API.

**Taskrouter**
- Less verbose naming of cumulative and real time statistics *(breaking change)*

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**Library**
- Fix camelCased custom twiml parameters getting converted to lower case. (Issue 349)

**Api**
- Add `voip`, `national`, `shared_cost`, and `machine_to_machine` sub-resources to `/2010-04-01/Accounts/{AccountSid}/AvailablePhoneNumbers/{IsoCountryCode}/`
- Add programmable video keys

**Preview**
- Add `verification_type` and `verification_document_sid` to HostedNumberOrders.

**Proxy**
- Fixed typo in session status enum value

**Twiml**
- Fix Dial record property incorrectly typed as accepting TrimEnum values when it actually has its own enum of values. *(breaking change)*
- Add `priority` and `timeout` properties to Task TwiML.
- Add support for `recording_status_callback_event` for Dial verb and for Conference