# Using the Amazon Chime SDK

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/amazon-chime-sdk-developer-guide.git)
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## Available regions

* **Note**\
  Regions marked with an asterisk (**\***) must be enabled in your AWS account. AWS blocks those regions by default. For more information about enabling regions, see [Enabling a Region](https://docs.aws.amazon.com/general/latest/gr/rande-manage.html) in the *AWS General Reference*.
* **Note**\
  To create a meeting in an AWS GovCloud (US) Region, you must use a control region in GovCloud. Also, control regions in GovCloud can only make meetings in AWS GovCloud (US) Regions.

## SIP integration

* **Note**\
  The Amazon Chime SDK recognizes phone numbers only in E.164 format. Make sure that an E.164 phone number is in your `From` header.

## Amazon Chime SDK event notifications

* **Note**\
  If you use the Amazon Chime SDK Meetings namespace, remember that you use a different service principal. Instead of using the `Chime` service principal, you use `ChimeSDKMeetings`. For more information about the namespaces, refer to [Migrating to the Amazon Chime SDK Meetings namespace](https://github.com/kevinslin/aws-reference-notes/blob/main/services/amazon_chime_sdk/meeting-namespace-migration.md).


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