Version 5.8
355
October 2009
SIP User's Manual
6. Configuration Parameters Reference
6.7.6
Fax and Modem Parameters
The fax and modem parameters are described in the table below.
Table
6-27: Fax and Modem Parameters
Parameter
Description
EMS: T38 Use RTP Port
[T38UseRTPPort]
Defines the port (with relation to RTP port) for sending and
receiving T.38 packets.
[0]
= Use the RTP port +2 to send / receive T.38 packets
(default).
[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 the parameter
T38UseRTPPort to 0.
Web/EMS: T.38 Max
Datagram Size
[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 122 to 1,024. The default value is 122.
Web/EMS: T38 Fax Max Buffer
[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 100 to 1,024. The default value is 1,024.
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, you must reset the device.
This parameters is applicable only if the
ini
file parameter
IsFaxUsed is set to 1 (T.38 Relay) or 3 (Fax Fallback).
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 CNGDetectorMode is set to 1 (default).
[1]
= Sends a SIP Re-INVITE upon detection of a fax CNG tone
when CNGDetectorMode is set to 1.
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