252
3Com
®
VCX V7111 VoIP Gateway User Guide
the RFC 2833 payload type using local and remote SDP and sends packets using the PT
from the received SDP. The gateway expects to receive RFC 2833 packets with the
same PT as configured by the RFC2833PayloadType parameter. If the remote side does
not include telephony-event in its SDP, the gateway sends DTMF digits in transparent
mode (as part of the voice stream).
3
Sending DTMF digits (in RTP packets) as part of the audio stream (DTMF Relay is
disabled):
Note that this method is normally used with G.711 coders; with other LBR coders the
quality of the DTMF digits is reduced.
To ser this mode:
TxDTMFOption = 0 (1
st
to 5
th
DTMF Option = Disable)
RxDTMFOption = 0 (Declare RFC 2833 in SDP = No)
DTMFTransportType = 2
(DTMF Transport Type = Transparent DTMF)
The gateway is always ready to receive DTMF packets over IP, in all possible
transport modes: INFO messages, NOTIFY and RFC 2833 (in proper payload type)
or as part of the audio stream.
To exclude RFC 2833 Telephony event parameter from the gateways SDP, set
RxDTMFOption = 0 in the
ini
file.
The following parameters affect the way the V7111 SIP handles the DTMF digits:
TxDTMFOption, RxDTMFOption and RFC2833PayloadType (described in
Table 22
).
MGCPDTMFDetectionPoint, DTMFDigitLength and DTMFInterDigitInterval (
Table 59
).
DTMFVolume and DTMFTransportType (
Table 56
).
Fax & Modem Transport Modes
Fax/Modem Settings
Users may choose to use one of the following transport methods for fax and for each modem
type (V.22/V.23/Bell/V.32/V.34):
Fax relay:
demodulation / modulation
Bypass:
using a high bit rate coder to pass the signal
Transparent:
passing the signal in the current voice coder
When the fax relay mode is 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
distinction is determined. The packets being sent to the network at this stage are T.38-
compliant fax relay packets.
Summary of Contents for VCX V7111
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