5.10.1.3. Outgoing DTMF functionality / Trunks that do NOT allow DTMF negotiation 
For an outgoing connection the DTMF for the originating party is ruled
by the DTMF parameters in AMO RICHT, DTMFCNV parameter.
- WITHOUT = No DTMF conversion for this route,
- FIX = Automatic DTMF conversion,
- SUFDIAL = Activation of conversion by means of suffix dialing (DTMF access code)
When the route is configured with DTMFCNV=FIX, the originator party will allocate
a MF
circuit Sender to convert the pressed digits into DTMF Signals directly in the voice
path.
When the route is configured with DTMFCNV=SUFDIAL, as soon the DTMF access code is
dialed,
the originator party will allocate a MF circuit Sender to convert digits into DTMF
Signals
directly in the voice path.
For the analog devices configured with DIAL=DTMF, this RICHT parameter does not apply,
since
they could be configured to send DTMF signaling by themselves.