3Com VCX V7122/SIP VoIP Gateway User Manual
75
Table 18
Channel Parameters
INI File Field Name
GUI Parameter Name
*
Valid Range and Description
V32ModemTransportType
(For V.32 and V.32bis modems) (V32
Modem Transport Type)
0 = Transparent
2 = Modem Bypass, (default)
V34ModemTransportType
(For V.34 and V.90 modems)
(V34 Modem Transport Type)
0 = Transparent
2 = Modem Bypass, (default)
DTMFVolume
(DTMF Volume)
-31 – 0 corresponding to -31 dBm to 0 dBm in 1 dB steps
(default = -11 dBm)
DTMF gain control
DTMFTransportType
(DTMF Transport Type)
0 = erase digit from voice stream, do not relayed to
remote
1 = erase digit from voice stream, relay to remote.
(Default)
2 = digits remains in voice stream
3 = erase digit from voice stream, relay to remote
according to RFC 2833
RFC2833PayloadType
(RFC 2833 Payload Type)
The RFC 2833 DTMF relay dynamic payload type
Range: 96 – 99, 106 – 127; Default = 96
The 100 – 105 range is allocated for 3Com proprietary
usage. Cisco uses payload type 101 for RFC 2833. The
same payload type should be used for receive and for
transmit.
InputGain
(Input Gain)
-31 to +31 in 1 dB steps (Default = 1 dB)
PCM input gain
VoiceVolume
(Voice Volume)
-31 to +31 in 1 dB steps
(Default = 1 dB). Voice gain control
M
(Packing Factor)
Number of codec payloads (10, 20 or 30 ms, depending
on selected codec) to be used for generating one RTP
packet.
M = n payloads (n = 1, 2, 3 or 4)
M = 1 (default)
RTPRedundancyDepth
(RTP Redundancy Depth)
0 = Disable redundancy packets generation (default)
1 = Enable generation of RFC 2198 redundancy packets
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