Thanks for that answer.
Preferable, we will aks our customer to use Backup server Mode in FMB settings.
However, server-side solution sounds better (less GSM transfer) - are there any instructions on how to create a request and what kind of answer is possible ? I understand TAVL is installed on a server (probably in cloud, not in that company's premises) so we can get the IP address of it, but what's next ?