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Table 299 Configuration items
Item Description
Fax Protocol
Configure the protocol used for fax communication with other devices.
• T.38 —Use T.38 fax protocol. With this protocol, a fax connection can be set up
quickly.
• Standard T.38—Use the standard T38 protocol of H.323 or SIP. The fax
negotiation mode depends on the protocol used (H323 or SIP).
Configure the fax pass-through mode.
• G.711 A-law.
• G.711 μ-law.
The pass-through mode is subject to such factors as packet loss, jitter and delay, so
the clocks on both communication sides must be kept synchronized. Only G.711
A-law and G.711 μ−law are supported, and the VAD function should be disabled.
ECM Fax
Enable ECM fax. As defined in ITU-T, the ECM is required by the half-duplex and
half-modulation system running ITU-T V.34 protocol for fax message transmission.
Besides, the G3 fax terminals working in full duplex mode are required to support
half-duplex mode, that is, ECM.
The fax machines using ECM can correct errors, provide the ARQ function, and
transmit fax packets in the format of HDLC frames. On the contrary, the fax
machines using non-ECM cannot correct errors and they transmit fax packets in the
format of binary strings.
• Enable—Enable ECM.
• Disable—Disable ECM.
By default, ECM is disabled.
To use ECM, fax machines on both sides and the gateway must support ECM.
You must enable ECM mode for the local numbers and call routes corresponding to
the fax sender and receiver in the ECM mode.
CNG Fax
Switchover Function
Enable CNG fax switchover function. The CNG fax switchover is used to implement
the fax mailbox service through communication with the VCX. When the local fax
machine A originates a fax call to the peer fax machine B, if B is busy or is
unattended, A can send the fax call to the fax mailbox of the VCX. With CNG fax
switchover enabled, the voice gateway can switch to the fax mode once it receives a
CNG from A.
• Enable.
• Disable.
The function is disabled by default.
Codec Type and
Switching mode for
SIP Modem
Pass-through
Configure the codec type and switching mode for SIP Modem pass-through function.
• Standard G.711 A-law—Adopt G.711 A-law as the codec type and use
Re-Invite switching for SIP Modem pass-through.
• Standard G.711 μ-law—Adopt the G.711 μ-law codec type and Re-Invite
switching mode.
• NTE Compatible G.711 A-law—Adopt the G.711 A-law codec type and
NTE-compatible switching mode.
• NTE Compatible G.711 μ-law—Adopt the G.711 μ-law codec type and
NTE-compatible switching mode.
NET Payload Type
Field
Configure the value of NTE payload type for the NTE-compatible switching mode.
This option is configurable only when
NTE Compatible G.711 A-law
or
NTE
Compatible G.711 μ-law
is selected in the
Codec Type and Switching Mode for
SIP Modem Pass-through
list.
By default, the value of the NTE payload type is 100.
Select the
Number(s)
Select the checkboxes of specific local numbers and then click the
Apply to
Selected Number(s)
button to apply the above fax and Modem settings to the
selected local numbers.
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