Fax Mail merge on WC7855 or Color560

Hi!

We have a WC7855 and a WC560 in our office.

We need the functionality to send a written letter (Mail Merge) to the Fax device in the printer without using the adressbook.

In our Letter is a textfield with the faxnumber (in Textcolor white - so the receiver cant see the field). When our actual Faxsolution gets the letter it recognizes this, use the number and send the letter.

In the Xerox case he receives the letter and i found no way to give him the number automatically. There´s always a pop up where he´s asking for the number. We send around 500 Letters per day

Any ideas ?

Thanks so far !