Version 6.2 423 February 2011
SIP User's Manual 10. Configuration Parameters Reference
Parameter Description
Web/EMS: Fax CNG Mode
[FaxCNGMode]
Determines the device's behavior upon detection of a CNG tone.
[0] = Does not send a SIP Re-INVITE upon detection of a fax
CNG tone when the parameter CNGDetectorMode is set to 1
(default).
[1] = Sends a SIP Re-INVITE upon detection of a fax CNG
tone when the parameter CNGDetectorMode is set to 1.
Web: Detect Fax on Answer Tone
EMS: Enables Detection of FAX
on Answer Tone
[DetFaxOnAnswerTone]
Determines when the device initiates a T.38 session for fax
transmission.
[0] Initiate T.38 on Preamble = The device to which the called
fax is connected initiates a T.38 session on receiving HDLC
Preamble signal from the fax (default).
[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.
Notes:
For this parameter to take effect, a device reset is required.
This parameters is applicable only if the parameter IsFaxUsed
is set to 1 (T.38 Relay) or 3 (Fax Fallback).
[T38FaxSessionImmediateStart]
Enables fax transmission of T.38 “no-signal” packets to the
terminating fax machine.
[0] Disable (default)
[1] Enable
This is used for transmission from fax machines (connected to
the device) located inside a Network Address Translation (NAT).
Generally, the firewall blocks T.38 (and other) packets received
from the WAN, unless the device behind NAT sends at least one
IP packet from the LAN to the WAN through the firewall. If the
firewall blocks T.38 packets sent from the termination IP fax, the
fax fails.
To overcome this, the device sends No-Op (“no-signal”) packets
to open a pinhole in the NAT for the answering fax machine. The
originating fax does not wait for an answer, but immediately
starts sending T.38 packets to the terminating fax machine.
Note: To enable No-Op packet transmission, use the
NoOpEnable and NoOpInterval parameters.
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