# Document history for the Amazon Chime SDK Developer Guide The following table describes important changes to the *Amazon Chime Developer Guide*, beginning in September 2019. For notifications about updates to this documentation, you can subscribe to an RSS feed. | Change | Description | Date | | --- |--- |--- | | [Alexa in-skill calling removed](#doc-history) | Due to changes by the Amazon Alexa team, you can no longer add Alexa calls to SIP media applications. For more information, refer to the [Alexa Smart Properties](https://developer.amazon.com/en-US/alexa/alexasmartproperties) page. | April 1, 2024 | | [New meeting Regions](#doc-history) | Developers can now use several new meeting Regions. For more information, refer to [Available Regions](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-available-regions.html) in this guide, and [Amazon Chime SDK endpoints and quotas](https://docs.aws.amazon.com/general/latest/gr/chime-sdk.html), in the *AWS General Reference*. | September 25, 2023 | | [Voice enhancement](#doc-history) | Developers can now enable call recording and store the recorded calls in an Amazon S3 bucket. For more information, refer to [Understanding voice enhancement](https://docs.aws.amazon.com/chime-sdk/latest/dg/call-analytics.html) in this guide. | August 31, 2023 | | [Updated regions](#doc-history) | Developers who use the Amazon Chime SDK can now use more regions. For more information, refer to [Available regions](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-available-regions.html). | August 29, 2023 | | [Call analytics and voice analytics](#doc-history) | Developers can now add low-code analytics and transcription capabilities to their solutions. For more information, refer to [Using Amazon Chime SDK call analytics](https://docs.aws.amazon.com/chime-sdk/latest/dg/call-analytics.html) in this guide. | March 27, 2023 | | [Client library for Windows](#doc-history) | Developers can now use the Amazon Chime SDK client library for Windows, written in C\+\+. For more information, refer to [ Amazon Chime SDK client library for Windows](https://docs.aws.amazon.com/chime-sdk/latest/dg/client-lib-windows.html) in this guide. | February 2, 2023 | | [Updated regions](#doc-history) | Developers who use the Amazon Chime SDK can now use more regions. For more information, refer to [Available regions](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-available-regions.html). | November 18, 2022 | | [C\+\+ client library on GitHub](#doc-history) | Developers who use Amazon Chime SDK Meetings can now integrate with a C\+\+ signaling client library on GitHub. For more information, refer to [Integrating with a client library](https://docs.aws.amazon.com/chime-sdk/latest/dg/mtgs-sdk-client-lib.html). | August 19, 2022 | | [Media pipelines](#doc-history) | Developers who use Amazon Chime SDK Meetings now create *media pipelines*. In turn, media pipelines consist of media capture pipelines, media concatenation pipelines, and live connector pipelines. For more information, refer to [Creating Amazon Chime SDK media pipelines](https://docs.aws.amazon.com/chime-sdk/latest/dg/media-pipelines.html). | August 18, 2022 | | [Elastic channels](#doc-history) | Developers who use Amazon Chime SDK Messaging can now use elastic channels in their chat solutions. Elastic channels can host up to 1-million users. For more information, refer to [Using elastic channels to host live events](https://docs.aws.amazon.com/chime-sdk/latest/dg/elastic-channels.html). | August 12, 2022 | | [Emergency 911 address validation](#doc-history) | Developers who use Amazon Chime SDK Meetings can programmatically validate the addresses that emergency calls originate from. For more information, refer to [https://docs.aws.amazon.com/chime/latest/APIReference/API_ValidateE911Address.html](https://docs.aws.amazon.com/chime/latest/APIReference/API_ValidateE911Address.html) in the *Amazon Chime API Reference.* and [Validating addresses for emergency calls](https://docs.aws.amazon.com/chime-sdk/latest/ag/validate-emergency-addresses.html) in the *Amazon Chime SDK Administration Guide*. | August 11, 2022 | | [Meeting tags update](#doc-history) | Developers can now use meeting tags in the `Chime` and `ChimeSDKMeetings` namespaces. For more information, see [Migrating to the Amazon Chime SDK Meetings namespace](https://docs.aws.amazon.com/chime-sdk/latest/dg/meeting-namespace-migration.html). | August 4, 2022 | | [CallAndBridge action for Voice Connectors and Voice Connector groups](#doc-history) | Developers who use the Amazon Chime SDK Audio Service can use the `CallAndBridge` action to place outbound calls to SIP trunks configured as Voice Connectors or Voice Connector Groups. For more information, refer to [https://docs.aws.amazon.com/chime-sdk/latest/dg/call-and-bridge.html](https://docs.aws.amazon.com/chime-sdk/latest/dg/call-and-bridge.html). | July 14, 2022 | | [AppKeys and TenantIDs](#doc-history) | Developers who use Amazon Chime SDK Meetings can now use `AppKeys` and `TenantIDs` to control access to WebRTC media sessions from their customer's networks. For more information, refer to [Using AppKeys and Tenant IDs](https://docs.aws.amazon.com/chime-sdk/latest/dg/app-keys-tenant-ids.html). | July 7, 2022 | | [Connect API](#doc-history) | Developers who use Amazon Chime SDK Messaging can now use WebSockets to connect to back-end servers and receive messages for an `AppInstanceUser`. For more information, refer to [Using the connect API](https://docs.aws.amazon.com/chime-sdk/latest/dg/connect-api.html) and [Using WebSockets to receive messages](https://docs.aws.amazon.com/chime-sdk/latest/dg/websockets.html). | June 6, 2022 | | [Attendee capabilities](#doc-history) | Developers can now use capabilities to control attendees' access to audio, video, and content during Amazon Chime SDK meetings. For more information, refer to [https://docs.aws.amazon.com/chime-sdk/latest/APIReference/API_meeting-chime_AttendeeCapabilities.html](https://docs.aws.amazon.com/chime-sdk/latest/APIReference/API_meeting-chime_AttendeeCapabilities.html) in the *Amazon Chime SDK API Reference*. | June 2, 2022 | | [Amazon CloudWatch metrics](#doc-history) | Developers can now take advantage of service and usage metrics that the Amazon Chime SDK publishes to CloudWatch. The metrics enable you to use CloudWatch graphs and dashboards to monitor how you consume Amazon Chime SDK services. For more information see [Amazon CloudWatch metrics](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-usage-metrics.html). | June 1, 2022 | | [Echo reduction](#doc-history) | Developers can now implement echo reduction, which helps keep echoes—sounds from a user’s loudspeaker that get picked up by their microphone—from circulating back into meeting audio and bringing discussions to a standstill. For more information, refer to [Using echo reduction](https://docs.aws.amazon.com/chime-sdk/latest/dg/use-echo-reduction.html). | November 23, 2021 | | [Call recording](#doc-history) | Developers can now implement audio recording on one or more legs of an Amazon Chime SDK SIP media application call. For more information, refer to [Using call recording](https://docs.aws.amazon.com/chime-sdk/latest/dg/sip-apps-call-record.html). In addition, the `RecordAudio` action now includes new parameters, including `SilenceDurationInSeconds` and `RecordingTerminatorUsed`. For more information, refer to [https://docs.aws.amazon.com/chime-sdk/latest/dg/record-audio.html](https://docs.aws.amazon.com/chime-sdk/latest/dg/record-audio.html). | October 28, 2021 | | [Background blur](#doc-history) | Developers can now add background blur to their Amazon Chime SDK applications. For more information, refer to [Using background blur](https://docs.aws.amazon.com/chime-sdk/latest/dg/background-blur.html). | October 21, 2021 | | [Updated IAM policy](#doc-history) | Developers now have an updated IAM policy that supports live transcription for Amazon Chime SDK meetings. For more information, refer to [Creating IAM users or roles with the Chime SDK policy](https://docs.aws.amazon.com/chime-sdk/latest/dg/iam-users-roles.html). | September 22, 2021 | | [SIP headers](#doc-history) | Developers can now send and receive a User-To-User header, a Diversion header, and custom SIP headers in their AWS Lambda functions. For more information, refer to [Using SIP headers](https://docs.aws.amazon.com/chime-sdk/latest/dg/sip-headers.html). | September 13, 2021 | | [Amazon Chime SDK meetings](#doc-history) | Developers can now use Amazon Chime SDK live transcription. For more information, refer to [ Using Amazon Chime SDK live transcription](https://docs.aws.amazon.com/chime-sdk/latest/dg/meeting-transcription.html). | August 11, 2021 | | [Amazon Chime SDK meetings](#doc-history) | Developers can now create media pipelines. For more information, refer to [ Creating Amazon Chime SDK media capture pipelines](https://docs.aws.amazon.com/chime-sdk/latest/dg/media-capture.html). | July 7, 2021 | | [Using SIP media applications with AWS Lambda functions](#doc-history) | Title changed from "Lambda functions SDK" and content in all topics revised for accuracy. CallAndBridge section added. For more information, refer to [Using the PSTN audio service](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-use-pstn-service.html) and [https://docs.aws.amazon.com/chime-sdk/latest/dg/call-and-bridge.html](https://docs.aws.amazon.com/chime-sdk/latest/dg/call-and-bridge.html). | June 17, 2021 | | [Lambda functions SDK](#doc-history) | Developers can build custom Lambda functions for use in the Amazon Chime SDK SIP media applications created by Amazon Chime SDK administrators. For more information, refer to [Using the PSTN audio service](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-use-pstn-service.html) in the *Amazon Chime Developer Guide*. | November 17, 2020 | | [JavaScript SDK](#doc-history) | Developers can use JavaScript to build Amazon Chime SDK applications. For more information, refer to [Using the Amazon Chime SDK for JavaScript](https://docs.aws.amazon.com/chime-sdk/latest/dg/js-sdk-intro.html) in the *Amazon Chime Developer Guide*. | November 17, 2020 | | [Android and iOS client libraries](#doc-history) | Developers can find the client libraries for Android, iOS, and Windows in less time and with fewer clicks. For more information, refer to [Using the Amazon Chime SDK client library for Android](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-for-android.html) and [Using the Amazon Chime SDK client library for iOS](https://docs.aws.amazon.com/chime-sdk/latest/dg/sdk-for-ios.html) in the *Amazon Chime Developer Guide*. | November 17, 2020 | | [Proxy phone sessions](#doc-history) | Developers can create proxy phone sessions for use with Amazon Chime SDK Voice Connectors. For more information, refer to [Using the Amazon Chime SDK for JavaScript](https://docs.aws.amazon.com/chime-sdk/latest/dg/use-javascript-sdk-top.html) in the *Amazon Chime Developer Guide*. | April 7, 2020 | | [Amazon Chime SDK content sharing](#doc-history) | The Amazon Chime SDK supports content sharing. For more information, refer to [Amazon Chime SDK architecture](https://docs.aws.amazon.com/chime-sdk/latest/dg/meetings-sdk.html#mtg-arch) in the *Amazon Chime Developer Guide*. | March 31, 2020 | | [Amazon Chime SDKs for Android and iOS](#doc-history) | The Amazon Chime SDKs for Android and iOS is released. For more information, refer to [Integrating with a client library](https://docs.aws.amazon.com/chime-sdk/latest/dg/mtgs-sdk-client-lib.html) in the *Amazon Chime Developer Guide*. | March 24, 2020 | | [Amazon Chime SDK](#doc-history) | The Amazon Chime SDK is released. For more information, refer to [Using the Amazon Chime SDK](https://docs.aws.amazon.com/chime-sdk/latest/dg/meetings-sdk.html) in the *Amazon Chime Developer Guide*. | November 20, 2019 | | [Amazon Chime Developer Guide](#doc-history) | The *Amazon Chime Developer Guide* is released. | September 11, 2019 |