Extranet users can be invited by Bitrix24 employees. Bitrix24 employees can discuss questions in the Extranet workgroup or project with the Extranet users, work with files and documents, add tasks to Extranet users, etc.
The table shows a comparison of the capabilities of intranet and extranet users, grouped by the functionality they have access to:
You can invite Extranet users on any Bitrix24 plan, but they are included in the limited number of users who are allowed on your Bitrix24 plan and have access to business tools.
In Bitrix24 On-Premise version, Extranet users are counted as active users, their number is limited according to your license key.