Standard fax routing

With standard fax routing, callers must navigate to the fax mailbox themselves before sending the fax.  This involves dialing the main number for the auto attendant, then dialing the mailbox extension (or selecting a single digit action that redirects the call to that mailbox), then selecting the single digit action key that is assigned the Fax action.  Only then can they press Start (or Send) on their fax machine.  If their fax machine allows it, they may be able to program the whole sequence of DTMF digits, including any needed pauses, and then press Start (or Send) to dial the number and send the fax.

If fax tone detection is enabled for the mailbox, they only need to get from the auto attendant to the mailbox greeting before sending the fax (eliminating the need to select an SDA key at the end).

Warning:  If you do enable fax tone detection in a mailbox, be aware that it can cause talk-off (mistaking a caller's voice for CNG tone).