MP-1xx SIP User’s Manual 5. Configuring the MP-1xx
Version 4.4 119 March 2005
Table 5-35 describes the Channel parameters that can only be configured via the ini file.
Table 5-35: Channel Settings, ini File Parameters
ini File Parameter
Name
Valid Range and Description
ECHybridLoss
0 = 6 dB (default)
1 = 9 dB
2 = 0 dB
3 = 3 dB
Sets the four wire to two wire worst case Hybrid loss, the ratio between the signal level sent
to the hybrid and the echo level returning from the hybrid.
FaxModemRelayVolume
-18 to -3, corresponding to -18 dBm to -3 dBm in 1 dB steps. (Default = -12 dBm) fax gain
control.
T38ProtectionMode
0 = Use redundancy packets for protecting T.38 fax relay stream, (default)
1 = Use Forward Error Correction (FEC) algorithm to protect T.38 fax relay stream (isn’t
implemented)
MGCPDTMFDetectionP
oint
0 = DTMF event is reported on the start of a detected DTMF digit.
1 = DTMF event is reported on the end of a detected DTMF digit (default).
The parameter is used for out-of-band dialing (using SIP INFO messages).
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.
TestMode
0 = CoderLoopback, encoder-decoder loopback inside DSP.
1 = PCMLoopback, loopback the incoming PCM to the outgoing PCM.
2 = ToneInjection, generates a 1000 Hz tone to outgoing PCM.
3 = NoLoopback, (default).
ModemBypassPayloadT
ype
Modem Bypass dynamic payload type (range 0-127).
The default value is 103.
DetFaxOnAnswerTone
0 = Starts T.38 procedure on detection of V.21 preamble (default).
1 = Starts T.38 Procedure on detection of CED fax answering tone.
FaxModemBypassBasic
RtpPacketInterval
0 = set internally (default)
1 = 5 msec
2 = 10 msec
3 = 20 msec
NSEMode
Cisco compatible fax and modem bypass mode
0 = NSE disabled (default)
1 = NSE enabled
Note 1: This feature can be used only if VxxModemTransportType=2 (Bypass)
Note 2: If NSE mode is enabled the SDP contains the following line:
“a=rtpmap:100 X-NSE/8000”
Note 3: To use this feature:
• The Cisco gateway must include the following definition: "modem passthrough nse
payload-type 100 codec g711alaw".
• Set the Modem transport type to Bypass mode (‘VxxModemTransportType = 2’) for all
modems.
• Configure the gateway parameter NSEPayloadType= 100
In NSE bypass mode the gateway starts using G.711 A-Law (default) or G.711µ-Law,
according to the parameter ‘FaxModemBypassCoderType’. The payload type used with
these G.711 coders is a standard one (8 for G.711 A-Law and 0 for G.711 µ-Law). The
parameters defining payload type for the “old” AudioCodes’ Bypass mode.
‘FaxBypassPayloadType’ and ‘ModemBypassPayloadType’ are not used with NSE Bypass.
The bypass packet interval is selected according to the parameter
‘FaxModemBypassBasicRtpPacketInterval’.
NSEPayloadType
NSE payload type for Cisco Bypass compatible mode.
The valid range is 96-127. The default value is 105.
Note: Cisco gateways usually use NSE payload type of 100.
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