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Bitrix24

Bitrix24 is a unified communication software and productivity tool for small businesses.

DAVdroid setup

Use "Login with URL/user name".

CalDAV/CardDAV URL: https://yourserver.bitrix24.com/bitrix/groupdav.php/s1/

CardDAV

Address-book synchronization is one-way (Bitrix24 → Android) and will only synchronize employees (not customers).