AudioCodes Media Pack MP-124, User Manual

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User's Manual 508 Document #: LTRT-65422
MP-11x & MP-124
Parameter Description
EMS: Enable Inband Network
Detection
[EnableFaxModemInbandNetwor
kDetection]
Enables in-band network detection related to fax/modem.

[0] = (Default) Disable.

[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]
Enables Cisco compatible fax and modem bypass mode.

[0] = (Default) NSE disabled

[1] = NSE enabled
In NSE bypass mode, the device starts using G.711 A-Law
(default) or G.711
µ
-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:
'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 is set to 2) for all modems.

Configure the gateway parameter NSEPayloadType =
100.

This parameter can also be configured in an IP Profile.
EMS: NSE Payload Type
[NSEPayloadType]
Defines the NSE payload type for Cisco Bypass compatible
mode.
The valid range is 96-127. The default is 105.
Note: Cisco gateways usually use NSE payload type of 100.
EMS: T38 Use RTP Port
[T38UseRTPPort]
Defines the port (with relation to RTP port) for sending and
receiving T.38 packets.

[0] = (Default) Use the RTP port +2 to send/receive T.38
packets.

[1] = Use the same port as the RTP port to send/receive
T.38 packets.
Notes:

For this parameter to take effect, you must reset the device.

When the device is configured to use V.152 to negotiate
audio and T.38 coders, the UDP port published in SDP for