Version 6.2 743 February 2011
SIP User's Manual 12. Configuration Parameters Reference
12.12 Gateway and IP-to-IP Parameters
12.12.1 Fax and Modem Parameters
The fax and modem parameters are described in the table below.
Table 12-34: 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 T38UseRTPPort
parameter 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 120 to 600. The default value is 560.
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 500 to 3000. The default value is 3000.
Web/EMS: Enable Fax Re-
Routing
[EnableFaxReRouting]
Enables or disables re-routing of Tel-to-IP calls that are identified
as fax calls.
[0] Disable = Disabled (default).
[1] Enable = Enabled.
If a CNG tone is detected on the Tel side of a Tel-to-IP call, the
prefix "FAX" is appended to the destination number before
routing and manipulations. A value of "FAX" entered as the
destination number in the 'Outbound IP Routing Table' is then
used to route the call and the destination number manipulation
mechanism is used to remove the "FAX" prefix, if required.
If the initial INVITE used to establish the voice call (not fax) was
already sent, a CANCEL (if not connected yet) or a BYE (if
already connected) is sent to tear down the voice call.
Notes:
To enable this feature, set the parameter CNGDetectorMode
to 2 and the parameter IsFaxUsed to 1, 2, or 3.
The "FAX" prefix in routing and manipulation tables is case-
sensitive.
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