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Mediant 2000 SIP User’s Manual 8. Gateway Capabilities Description
Version 4.4 145 July 2005
Table 8-3: Summary of DTMF Configuration Parameters (continues on pages 144 to 145)
ini File Field Name
[Web Name]
Valid Range and Description
RxDTMFOption
Defines the supported Receive DTMF negotiation method.
0 = Don’t declare RFC 2833 Telephony-event parameter in SDP
1 = n/a
2 = n/a
3 = Declare RFC 2833 “Telephony-event” parameter in SDP (default)
The gateway is designed to always be receptive to RFC 2833 DTMF relay packets.
Therefore, it is always correct to include the “Telephony-event” parameter as a default in
the SDP. However some gateways use the absence of the “telephony-event” from the
SDP to decide to send DTMF digits inband using G.711 coder, if this is the case you can
set “RxDTMFOption=0”.
RFC2833PayloadType
The RFC 2833 DTMF relay dynamic payload type.
Range: 96 to 99, 106 to 127; Default = 96
The 100, 102 to 105 range is allocated for proprietary usage.
Cisco is using payload type 101 for RFC 2833.
Note: When RFC 2833 payload type (PT) negotiation is used (TxDTMFOption=4), this
payload type is used for the received DTMF packets. If negotiation isn’t used, this
payload type is used for receive and for transmit.
MGCPDTMFDetectionPont
0 = Send out of-band DTMF message on starting point of DTMF digit
1 = Send DTMF message on ending point of DTMF digit (default)
DTMFDigitLength
Time in msec for generating DTMF tones to the PSTN side (if received in INFO).
The default value is 100 msec.
DTMFInterDigitInterval
Time in msec between generated DTMFs to PSTN side (if received in INFO).
The default value is = 100 msec.
DTMFVolume
[DTMF Volume]
DTMF level for regenerated digits to PSTN side (-31 to 0, corresponding to -31 dBm to 0
dBm in 1 dB steps, default = -11 dBm)
DTMFTransportType
[DTMF Transport Type]
0 = Erase digits from voice stream, do not relay to remote.
2 = Digits remain in voice stream.
3 = Erase digits from voice stream, relay to remote according to RFC 2833.
Note: This parameter is automatically updated if one of the following parameters is
configured: IsDTMFUsed, TxDTMFOption or RxDTMFOption.