AudioCodes Mediant 500 MSBR, User Manual

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Version 7.2 1093 Mediant 500 MSBR
User's Manual 74. Configuration Parameters Reference
NSE-mode
[NSEMode]
Global parameter that enables Cisco's compatible fax and modem
bypass mode, Named Signaling Event (NSE) packets. You can
also configure this feature per specific calls, using IP Profiles
(IpProfile_NSEMode). For a detailed description of the parameter
and for configuring this feature in the IP Profiles table, see
Configuring IP Profiles on page 404.
Note: If this feature is configured for a specific IP Profile, the
settings of this global parameter is ignored for calls associated with
the IP Profile.
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:

The parameter is applicable only to the Gateway application.

Cisco gateways usually use NSE payload type of 100.
configure voip > sip-definition
settings > 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.
Note:

For the 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.
T.38 Max Datagram Size
configure voip > sip-definition
settings > t38-mx-datagram-sz
[T38MaxDatagramSize]
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 560.
T38 Fax Max Buffer
configure voip > sip-definition
settings > t38-fax-mx-buff
[T38FaxMaxBufferSize]
Defines the maximum size (in bytes) of the device's T.38 buffer.
This value is included in the outgoing SDP when T.38 is used for
fax relay over IP.
The valid range is 500 to 3000. The default is 3000.
Detect Fax on Answer Tone
det-fax-on-ans-tone
[DetFaxOnAnswerTone]
Determines when the device initiates a T.38 session for fax
transmission.

[0] Initiate T.38 on Preamble = (Default) The device to which
the called fax is connected initiates a T.38 session on receiving
HDLC Preamble signal from the fax.

[1] Initiate T.38 on CED = The device to which the called fax is
connected initiates a T.38 session on receiving a CED answer
tone from the fax. This option can only be used to relay fax
signals, as the device sends T.38 Re-INVITE on detection of
any fax/modem Answer tone (2100 Hz, amplitude modulated
2100 Hz, or 2100 Hz with phase reversals). The modem signal
fails when using T.38 for fax relay.
Note: The parameters is applicable only if the IsFaxUsed
parameter is set to 1 (T.38 Relay) or 3 (Fax Fallback).