Version 6.6 575 October 2014
Installation & Operation Manual 40. General SIP Configuration
Parameter
Name
Type
Provisio
ning
Type
Description
Esc
Transport
Type
Enum
UDP,TCP,TLS
Instant Determines the transport layer
used for outgoing SIP dialogs
initiated by the device to the RTCP
XR Collection Server.
T38
Session
Immediate
Start
Enum
Disable, Enable,
EnableforT38andAudio
Instant Enables fax transmission of T.38
“no-signal” packets to the
terminating fax machine.
[0] Disable (default)
[1] Enable
[2] EnableforT38andAudio
This parameter is used for the
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 the 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.
SIP T38
Version
SIP
Protocol
Enum
T38Ver_0, T38 Ver_3
Instant Selects the T.38 fax relay version.
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