Faxing with 3 Grandstream HT801 with rollover?

[TownTech]

I have 3 Grandstream HT801 setup as user extensions using the "Add DECT / FXS".
Customer wants to have the faxes rollover so if the fax DID number is being used on the 1st fax machine, he wants it to go to the 2nd fax machine to receive the fax and if that one is tied up, go to the 3rd fax machine. He has 1 fax number he is using.
Is this possible?

 

[NicholasP_3CX]

The fax extensions are specific extensions used as faxes, with unique settings tweaked for faxing. These extensions do not have forwarding rules.

So, no you will not be able to do this. If a fax is busy, the remote fax machine sending should retry after a certain amount of time.

Each fax extensions would need its own DID.

It would best for you to have it going to the 3CX Fax server to do this rather than individual fax machines, and just use these devices to send faxes.