FAX Server issue - Outgoing FAX with Fax server via ATA(HT812 Grand stream Model)

[Pratik.gedam]

ATA is registered with Extension, we need to send fax from ATA to FAX Number via Fax server.
How can we achieve that?

Currently we create one extension for ATA and that is registered
We have create one inbound route for FAX number and route that call on FAX server extension and calls goes well.
However, using this we can only receive the fax in inbox not in sent box.

We need to be send FAX outside using FAX Server.
Please assist me with solution/routing details if anyone can.

Thanks in Advance,