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About MultiJoin for Microsoft Teams

When a user schedules a meeting in MS Teams, they can add a StarLeaf room system from their room resources to the location field of the meeting invite.

Microsoft auto-completes the room’s Microsoft Exchange address. In the example below, a user chose the room Belfort and Microsoft auto-populated the location field with Belfort’s email address (belfort@xampleco.com).

To cause the green Join button on StarLeaf room systems to light up for third-party meetings, a user must invite the .call.sl address of the StarLeaf room system to the MS Teams meeting. However, users are unlikely to know this address.

The solution is to integrate third-party meetings with MS Exchange room booking and StarLeaf. In this way, users can continue to invite rooms to their meetings (as they usually do) and the Exchange system will redirect the meeting invites to the StarLeaf room system.

There are two steps involved:

  • Configure the StarLeaf room system with the Exchange email address
  • Configure the MS Exchange mailbox to redirect meeting invites to the room’s .call.sl address


  • StarLeaf Enterprise Room Subscription
  • CVI gateway must be provisioned that enables you to dial into MS Teams meetings from StarLeaf room systems. This gateway could be from Pexip, Poly, or BlueJeans
  • Your StarLeaf room systems must be configured as room mailboxes in your Microsoft Exchange Server (see here for more information).

How to integrate Teams meetings with Microsoft Exchange and StarLeaf

Configure the StarLeaf room system with the exchange email address

  1. Ensure that your organization allows room systems to be configured with an email address. If it does not, you will need to contact StarLeaf Support to have this feature enabled.
  2. Go to StarLeaf Portal > Room systems > Edit room system.
  3. In the Email address field, add the room’s Exchange email address.
  4. In the example below, the meeting room’s Exchange email address is belfort@xampleco.com:

    and the room’s .call.sl address is belfort@xampleco.call.sl.

Configure the Exchange mailbox to redirect meeting invites to the ‘.call.sl’ address

  1. Log in to the Exchange admin enter (as an admin).
  2. Go to Mail flow > Rules.
  3. Create a new rule.
  4. At the bottom of this screen, select More options.
  5. Set Apply this rule if… and add the following two rules:
    • The recipient is… and select the name of the room account
    • The message properties… > include the message type and choose Calendaring

  6. Go to *Do the following… > Cc the message to…
  7. Enter the .call.sl address of the room using Check names.
  8. Select Save.

Testing the configuration

After you have redirected meeting invites to the room system’s .call.sl address and you have configured the StarLeaf room system with the exchange email address for that room, test that this works. For example, invite the meeting room to a meeting using the room’s email address and see if the green Join button lights up for the meeting.

How languages are supported

When a participant uses the join button to join a Teams meeting, they will be greeted in the language appropriate to the location of the data center in which the organization’s StarLeaf account is hosted. For example, if your StarLeaf account is hosted in StarLeaf’s data center in Germany, you will be greeted in German.

Known limitations

Reference ID Description
27048 StarLeaf green buttons for Microsoft Teams meetings that use Pexip as the Teams gateway provider will not always work with Office 365 ATP Safe Links . A fix for this is coming soon