MP-1xx SIP
MP-1xx SIP User’s Manual 152 Document #: LTRT-65404
Table 8-1: Summary of DTMF configuration Parameters (continues on pages 151 to 152)
ini File Field Name
[Web Name]
Valid Range and Description
RFC 2833 Payload Type
[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.
Note 1: Cisco is using payload type 101 for RFC 2833.
Note 2: 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.
MGCPDTMFDetectionPoin
t
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.
8.3 Configuring the Gateway’s Alternative Routing
(based on Connectivity and QoS)
The Alternative Routing feature enables reliable routing of Tel to IP calls when a Proxy isn’t used.
The MP-1xx gateway periodically checks the availability of connectivity and suitable Quality of
Service (QoS) before routing. If the expected quality cannot be achieved, an alternative IP route
for the prefix (phone number) is selected.
8.3.1 Alternative Routing Mechanism
When a TelIP call is routed through the MP-1xx gateway, the call’s destination number is
compared to the list of prefixes defined in the Tel to IP Routing table (described in Section
5.8.4.2
on page 75). The Tel to IP Routing table is scanned for the destination number’s prefix starting at
the top of the table. When an appropriate entry (destination number matches one of the prefixes)
is found; the prefix’s corresponding destination IP address is checked. If the destination IP
address is disallowed, an alternative route is searched for in the following table entries.
Destination IP address is disallowed if no ping to the destination is available (ping is continuously
initiated every 7 seconds), when an inappropriate level of QoS was detected, or when DNS host
name is not resolved. The QoS level is calculated according to delay or packet loss of previously
ended calls. If no call statistics are received for two minutes, the QoS information is reset.
The MP-1xx gateway matches the rules starting at the top of the table. For this reason, enter the
main IP route above any alternative route.
8.3.2 Determining the Availability of Destination IP Addresses
To determine the availability of each destination IP address (or host name) in the routing table,
one (or all) of the following (configurable) methods are applied:
• Connectivity - The destination IP address is queried periodically (currently only by ping).
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