User's Manual 1112 Document #: LTRT-27055
Mediant 1000B Gateway & E-SBC
Parameter Description
settings > t38-sess-imm-strt
[T38FaxSessionImmediateSta
rt]
[1] Immediate Start on
Fax = Device activates T.38 fax relay upon
receipt of a re-INVITE with T.38 only in the SDP.
[2] Immediate Start on Fax & Voice = Device activates T.38 fax
relay upon receipt of a re-INVITE with T.38 and audio media in
the SDP.
The parameter is used for transmission from fax machines
connected to the device and located inside a 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.
65.10.2 DTMF and Hook-Flash Parameters
The DTMF and hook-flash parameters are described in the table below.
Table 65-39: DTMF and Hook-Flash Parameters
Parameter Description
Hook-Flash Parameters
Hook-Flash Code
configure voip > gateway dtmf-supp-
service supp-service-settings > hook-
flash-code
[HookFlashCode]
Analog interfaces: Defines the digit pattern that when
received from the Tel side, indicates a Hook Flash event.
Digital interfaces: Defines the digit pattern used by the PBX
to indicate a Hook Flash event. When this pattern is
detected from the Tel side, the device responds as if a Hook
Flash event has occurred and sends a SIP INFO message if
the HookFlashOption parameter is set to 1, 5, 6, or 7
(indicating a Hook Flash). If configured and a Hook Flash
indication is received from the IP side, the device generates
this pattern to the Tel side.
The valid range is a 25-character string. The default is a null
string.
Note: The parameter can also be configured in a Tel Profile.
Hook-Flash Option
configure voip > gateway dtmf-supp-
service dtmf-and-dialing > hook-flash-
option
[HookFlashOption]
Defines the hook-flash transport type (i.e., method by which
hook-flash is sent and received). For digital interfaces: The
feature is applicable only if the HookFlashCode parameter is
configured.
[0] Not Supported = (Default) Hook-Flash indication is
not sent.
[1] INFO = Sends proprietary INFO message (Broadsoft)
with Hook-Flash indication. The device sends the INFO
message as follows:
Content-Type: application/broadsoft; version=1.0
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