I thought this was an old issue on the Norstars that we had in the UK. I seem to remember that you had to press the hash # button to turn on DTMF tone dialling?.
This was a problem when calling a ATA unit fitted with an answer machine connected via the analogue port.
I've found this below from my old Norstar guide
End User View
OAM Programming allows any analogue line to be set up for tone dialing or pulse
dialing. On lines programmed for pulse dialing, the dial pad key is interpreted
as a pause until the key has been dialed on a call. The user can activate DTMF
signaling (that is, generate DTMF tones for all dial pad keys, including and
) by pressing the key.
The conversion of Pulse to Tone by pressing , lasts only for the duration of the
call. When the call is disconnected, the dialing mode reverts back to Pulse.
In Pulse dial mode, digits are initially sent out as pulses, and the key causes a
1.5 second pause to be inserted in the dialing stream.
The first “#” dialed on a pulse-dial line is not sent out. It converts the signaling
mode to dual-tone multi-frequency (DTMF) mode, and enables tone generation
for all subsequent digits, including the and keys.
In Tone dial mode, all dial pad key presses (digits, “*”, and “#”) are sent out as
DTMF tones.
All the best
Firebird Scrambler
Meridian 1 / Succession and BCM / Norstar Programmer in the UK
If it's working, then leave it alone!.