Captive Portal Logout URL

we have a setup with volume based / Data Usage Quota accounts.
It is not possible here to have the Concurrent Use Option.
Now we have user with more then 1 device. They want to logoff with device 1 and login with device 2.

Here comes my question: Is it possible to logout/logoff from the CP?
Is there a specific URL?

Thank for feedback,

Hi all,

We are having the same issue as Matthias - when utilizing a IC2 Captive Portal, we dont get the option in IC2 to create a logout host name, as you do with a local device created Captive Portal;

Could someone please advise if this is possible?