Version 6.2 415 February 2011
SIP User's Manual 10. Configuration Parameters Reference
Parameter Description
Web/EMS: Modem Bypass Output
Gain
[ModemBypassOutputGain]
Defines the modem bypass output gain control.
The range is -31 dB to +31 dB, in 1-dB steps. The default is 0
(i.e., no gain).
EMS: NTE Max Duration
[NTEMaxDuration]
Maximum time for sending Named Telephony Events (NTEs) to
the IP side regardless of the time range when the TDM signal is
detected.
The range is -1 to 200,000,000 msec (i.e., 55 hours). The
default is -1 (i.e., NTE stops only upon detection of an End
event).
EMS: Basic Packet Interval
[FaxModemBypassBasicRTPPac
ketInterval]
Determines the basic frame size that is used during fax/modem
bypass sessions.
[0] = Determined internally (default)
[1] = 5 msec (not recommended)
[2] = 10 msec
[3] = 20 msec
Note: When set to 5 msec (1), the maximum number of
simultaneous channels supported is 120.
EMS: Dynamic Jitter Buffer
Minimal Delay (dB)
[FaxModemBypasDJBufMinDela
y]
Determines the Jitter Buffer delay (in milliseconds) during fax
and modem bypass session.
The range is 0 to 150 msec. The default is 40.
EMS: Enable Inband Network
Detection
[EnableFaxModemInbandNetwor
kDetection]
Enables or disables in-band network detection related to
fax/modem.
[0] = Disable (default)
[1] = Enable
When this parameter is enabled on Bypass and transparent with
events mode (VxxTransportType is set to 2 or 3), a detection of
an Answer Tone from the network triggers a switch to bypass
mode in addition to the local Fax/Modem tone detections.
However, only a high bit-rate coder voice session effectively
detects the Answer Tone sent by a remote endpoint. This can
be useful when, for example, the payload of voice and bypass is
the same, allowing the originator to switch to bypass mode as
well.
EMS: NSE Mode
[NSEMode]
Cisco compatible fax and modem bypass mode.
[0] = NSE disabled (default)
[1] = NSE enabled
In NSE bypass mode, the device starts using G.711 A-Law
(default) or G.711μ-Law according to the
FaxModemBypassCoderType parameter. 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' Bypass mode FaxBypassPayloadType and
ModemBypassPayloadType are not used with NSE Bypass.
The bypass packet interval is selected according to the
FaxModemBypassBasicRtpPacketInterval parameter.
Notes:
This feature can be used only if the
VxxModemTransportType parameter is set to 2 (Bypass).
If NSE mode is enabled, the SDP contains the following line:
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