AudioCodes Mediant 3000 User Manual page 424

Parameter
EMS: Basic Packet Interval
[FaxModemBypassBasicRTPP
acketInterval]
EMS: Dynamic Jitter Buffer
Minimal Delay (dB)
[FaxModemBypassDJBufMinD
elay]
EMS: Enable Inband Network
Detection
[EnableFaxModemInbandNetw
orkDetection]
EMS: NSE Mode
[NSEMode]
SIP User's Manual
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 for 5 msec (1), the maximum number of
simultaneous channels supported is 120.
Determines the Jitter Buffer delay (in milliseconds) during fax and
modem bypass session.
The range is 0 to 150 msec. The default is 40.
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 = 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.
Cisco compatible fax and modem bypass mode.
[0] = NSE disabled (default)
[1] = NSE enabled
Notes:
This feature can be used only if VxxModemTransportType = 2
(Bypass).
If NSE mode is enabled, the SDP contains the following line:
'a=rtpmap:100 X-NSE/8000'.
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 device 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.
424
Description
Document #: LTRT-89707
Mediant 3000