AudioCodes Mediant 500 E-SBC, User Manual

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User's Manual 19. Coders and Profiles
Version 6.8 311 Mediant 500 E-SBC
Parameter Description
Web: CNG Detector Mode
CLI: cng-mode
[IpProfile_CNGmode] Enables the detection of the fax calling tone (CNG) and
defines the detection method.

[0] Disable = (Default) The originating fax does not detect
CNG; the device passes the CNG signal transparently to
the remote side.

[1] Relay = The originating fax detects CNG. The device
sends CNG packets to the remote side according to T.38
(if IsFaxUsed is set to 1) and the fax session is started. A
SIP Re-INVITE message is not sent and the fax session
starts by the terminating fax. This option is useful, for
example, when the originating fax is located behind a
firewall that blocks incoming T.38 packets on ports that
have not yet received T.38 packets from the internal
network (i.e., originating fax). To also send a Re-INVITE
message upon detection of a fax CNG tone in this mode,
set the parameter FaxCNGMode to 1 or 2.

[2] Event Only = The originating fax detects CNG and a
fax session is started by the originating fax, using the Re-
INVITE message. Typically, T.38 fax session starts when
the preamble signal is detected by the answering fax.
Some SIP devices do not support the detection of this fax
signal on the answering fax and thus, in these cases, it is
possible to configure the device to start the T.38 fax
session when the CNG tone is detected by the originating
fax. However, this mode is not recommended.
Note: The corresponding global parameter is
CNGDetectorMode.
Web: Vxx Modem Transport Type
CLI: vxx-transport-type
[IpProfile_VxxTransportType] Defines the modem transport type.

[-1 ] Not Configured = The settings of the global
parameters are used:

V21ModemTransportType

V22ModemTransportType

V23ModemTransportType

V32ModemTransportType

V34ModemTransportType

[0] Disable = Transparent.

[2] Enable Bypass (Default)

[3] Events Only = Transparent with Events.
For a detailed description of this parameter per modem type,
see the relevant global parameter (listed above).
Web: NSE Mode
CLI: nse-mode
[IpProfile_NSEMode] Enables Cisco's compatible fax and modem bypass mode,
Named Signaling Event (NSE) packets.

[0] Disable (Default)

[1] Enable
In NSE bypass mode, the device starts using G.711 A-Law
(default) or G.711

-Law, according to the
FaxModemBypassCoderType parameter. The payload type
for these G.711 coders is a standard one (8 for G.711 A-Law
and 0 for G.711

-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 configured according to the
FaxModemBypassBasicRtpPacketInterval parameter.