SIP User's Manual 100 Document #: LTRT-68806
Mediant 2000 & TP-1610 & TP-260/UNI
Table 5-11: DTMF and Dialing Parameters
Parameter Description
Max Digits in Phone Num
[MaxDigits]
Defines the maximum number of collected destination number digits that
can be received from the Tel side when Tel-to-IP overlap dialing is
performed (ISDN uses overlap dialing). When the number of collected
digits reaches the maximum, the gateway uses these digits for the called
destination number.
The valid range is 1 to 49. The default value is 30.
Notes: Digit Mapping Rules can be used instead.
Inter Digit Timeout for
Overlap Dialing [sec]
[TimeBetweenDigits]
Defines the time (in seconds) that the gateway waits between digits that
are received from the Tel side when Tel-to-IP overlap dialing is performed
(ISDN uses overlap dialing). When this inter-digit timeout expires, the
gateway uses the collected digits for the called destination number.
The valid range is 1 to 10 seconds. The default value is 4 seconds.
Declare RFC 2833 in
SDP
[RxDTMFOption]
Defines the supported Receive DTMF negotiation method.
 [0] No = Don't declare RFC 2833 telephony-event parameter in SDP.
 [3] Yes = 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 in-band using G.711 coder. If this is the case, you can set
RxDTMFOption to 0.
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