While H.323 and SIP-based room systems can be invited to a meeting once it has been started, room systems can also be called directly from the desktop and mobile client, without starting a meeting first. 

This article covers:

• How to enable Call a SIP/H.323 room system directly from the client
  • Account
  • Group
  • User
• How to call a room system
  • Call from the Zoom desktop client
  • Call from the Zoom mobile app
  • Call from the iPadOS client

Prerequisites for calling a room system directly from the client

• The caller must be a Licensed user
• Room Connector Add-on
• Zoom desktop client
  • Windows: version 4.4.52578.0415 or higher
  • macOS: version 4.4.52551.0414 or higher
• Zoom mobile app
  • Android: version 4.4.52504.0411 or higher
  • iOS: version 4.4.52578.0415 or higher

How to enable Call a SIP/H.323 room system directly from the client

Account

1. Sign in to the Zoom web portal.
2. In the navigation panel, click Account Management then Account Settings.
3. Click the Meeting tab.
4. Under More Settings, verify that Call a SIP/H.323 room system directly from the client
    is enabled.
5. If the setting is disabled, click the toggle to enable it. If a verification dialog displays, click Turn On to verify the change.
6. (Optional) If you want to make this setting mandatory for all users in your account, click the lock icon, and then click Lock to confirm the setting.

Group

1. Sign in to the Zoom web portal.
2. In the navigation panel, click User Management then Groups.
3. Click the applicable group name from the list, then click the Meeting tab.
4. Under Other, verify that Call a SIP/H.323 room system directly from the client
    is enabled.
5. If the setting is disabled, click the toggle to enable it. If a verification dialog displays, click Turn On to verify the change.
   Note: If the option is grayed out, it has been locked at the account level and needs to be changed at that level.
6. (Optional) If you want to make this setting mandatory for all users in the group, click the lock icon , and then click Lock to confirm the setting.

User

1. Sign in to the Zoom web portal.
2. In the navigation panel, click Settings.
3. Click the Meeting tab.
4. Under Other, verify that Call a SIP/H.323 room system directly from the client
   is enabled.
5. If the setting is disabled, click the toggle to enable it. If a verification dialog displays, click Turn On to verify the change.
   Note: If the option is grayed out, it has been locked at either the group or account level. You need to contact your Zoom admin.

How to call a room system

Call from the Zoom desktop client

1. Sign in to the Zoom desktop client.
2. On the Home tab, click Call a Room.
3. Click H.323/SIP, then enter the address of the room system.
4. Click Call.

Call from the Zoom mobile app

1. Sign in to the Zoom mobile app.
2. Tap Call a Room.
3. Tap H.323/SIP, then enter the address of the room system.
4. Tap Call.

Call from the iPadOS client

1. Sign in to the Zoom client on an iPad.
2. Tap Call a Room.
3. Tap H.323/SIP, then enter the address of the room system.
4. Tap Call.