3Com VCX V7122/SIP VoIP Gateway User Manual
161
A
PPENDIX
D:
DTMF,
F
AX
,
AND
M
ODEM
T
RANSPORT
M
ODES
DTMF/MF Relay Settings
You can control the way DTMF/MF digits are transported to the remote endpoint, using the
DTMFTransport/MFTransport configuration parameters. The following three modes are
supported:
DTMF/MFTransportType= 0 (MuteDTMF/MF). In this mode, DTMF/MF digits are erased
from the audio stream and are
not
relayed to the remote side. Instead, silence is sent in
the RTP stream.
DTMF/MFTransportType= 1 (RelayDTMF/MF). In this mode, DTMF/MF digits are erased
from the audio stream and
are
relayed to the remote side using a proprietary RTP
syntax.
DTMF/MFTransportType= 2 (TransparentDTMF/MF). In this mode, DTMF/MF digits are
left
in the audio stream and the DTMF/MF relay is disabled.
DTMF/MFTransportType= 3 (RelayDTMF/MF). In this mode, DTMF/MF digits are erased
from the audio stream and
are
relayed to the remote side according to RFC 2833
standard.
Fax/Modem Settings
You can choose to use for fax, and for each modem type (V.21/V.22/V.23/Bell/V.32/V.34),
one of the following transport methods:
Fax relay mode (demodulation / remodulation, not applicable for Modem)
Bypass (using a high bit rate coder to pass the signal)
Transparent (passing the signal in the current voice coder)
When any of the relay modes are enabled, distinction between fax and modem is not
immediately possible at the beginning of a session. The channel is therefore in Answer Tone
mode until a decision is made The packets sent to the network at this stage are fax relay
packets (The packets can be either T.38-complaint, or FRF.11-based proprietary syntax,
selected by setting the channel’s configuration parameter UseT38orFRF11.)
Configuring Fax Relay Mode
When FaxTransportType= 1 (relay mode), then when fax is detected the channel
automatically switches from the current voice coder to answer tone mode, and then to fax
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