AudioCodes Mediant 2000 User Manual

User's Manual 598 Document #: LTRT-68822
Mediant 2000
Parameter Description
fails when using T.38 for fax relay.
Note: This parameters is applicable only if the parameter
IsFaxUsed is set to 1 (T.38 Relay) or 3 (Fax Fallback).
Web: T38 Fax Session
Immediate Start
[T38FaxSessionImmediateSt
art]
Enables fax transmission of T.38 "no-signal" packets to the
terminating fax machine.
 [0] Disable (default)
 [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.
This 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.
45.11.2 DTMF and Hook-Flash Parameters
The DTMF and hook-flash parameters are described in the table below.
DTMF and Hook-Flash Parameters
Parameter Description
Hook-Flash Parameters
Web/EMS: Hook-Flash
Code
[HookFlashCode]
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: This parameter can also be configured in a Tel Profile.
Web/EMS: Hook-Flash
Option
[HookFlashOption]
Determines the hook-flash transport type (i.e., method by which hook-
flash is sent and received). This 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
Content-Length: 17

AudioCodes Mediant 2000 Specifications

General

Brand	AudioCodes
Model	Mediant 2000
Category	Gateway
Language	English