A quick outline:
When using a 4612IP phone I am unable to send DTMF when using a TDM trunk.
DTMF can be sent from other non-IP phones on this system.
DTMF can be sent when using an IP trunk.
System:
Version: Definity 9.5
C-Lan: TN799B
MedPro: TN2302AP
I would guess that on the IP FTP...
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