Programming switchboards: How is the Fax Switch function (automatic fax recognition) programmed?

The recognition (Fax Switch) function is programmed as follows.
From extension 41 key in:
98 1234 61 2 R (for urban line 1)
98 1234 62 2 R (for urban line 2)
This setting assumes that faxes arrive on both lines.
Set the fax extension.
98 1234 80 extension no. R.
Activate the service by keying in code 911 R from any telephone.
After entering the activation code 911 R you should hear a voice message indicating that the direct call service has been activated.
Code 910 R deactivates the direct call service and therefore the fax-switch function.