Version 6.4 643 March 2012
SIP User's Manual A. Configuration Parameters Reference
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 238.
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 1024.
Web/EMS: Enable Fax Re-
Routing
[EnableFaxReRouting]
Enables 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.
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
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