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Does Sinch support muting on an App to App call?

There is currently support to mute the input via on Android, and SINAudioController on iOS. Sinch does not support muting the output; it can only be done by the user via silencing their volume.

As a developer, can I access call history through the Sinch API?

No, we do not currently expose this information. This functionality will be part of our REST APIs.

What is the maximum number of users Sinch allows in a group chat?

At the moment, group conversation can include up to 10 users.

As a developer, can I backup or export user data, such as chat history?

Chat history is persisted for 30 days and can be retrieved through your app. Call history can be found in the developer portal.