A voice command (VC)-to-DTMF interfacing system that allows existing
DTMF-driven systems to be interacted with by a caller using voice
commands. The VC-to-DTMF interfacing system translates the voice command
from a caller into the DTMF codes which are then played through a port
for receipt by the DTMF-driven system. In a first mode, the voice
commands from the caller and the pre-recorded messages of the DTMF-driven
system are echo cancelled. In a second mode, a voice message is directly
streamed to the DTMF-driven system through an enabled port patch.