AudioCodes MP-11x User Manual page 569

User's Manual
Parameter
EMS: NSE Mode
[NSEMode]
EMS: NSE Payload Type
[NSEPayloadType]
EMS: T38 Use RTP Port
[T38UseRTPPort]
Web/EMS: T.38 Max Datagram
Size
[T38MaxDatagramSize]
Version 6.6
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.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:
'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.
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.
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
RTP and for T38 must be different. Therefore, set the
T38UseRTPPort parameter to 0.
Defines the maximum size of a T.38 datagram that the device
can receive. This value is included in the outgoing SDP when
T.38 is used.
The valid range is 120 to 600. The default is 238.
569
44. Configuration Parameters Reference
Description
MP-11x & MP-124