AudioCodes Mediant 500 MSBR, User Manual

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User's Manual 1052 Document #: LTRT-10375
Mediant 500 MSBR
[TDMOverIPMinCallsForT
runkActivation] active.
When using TDM Tunneling, if calls from this defined number of B-
channels pertaining to a specific Trunk fail (i.e., SIP dialogs are not
correctly set up), an AIS alarm is sent on this trunk toward the PSTN
and all current calls are dropped. The originator gateway continues the
INVITE attempts. When this number of calls succeed (i.e., SIP dialogs
are correctly set up), the AIS alarm is cleared.
The valid range is 0 to 31. The default is 0 (i.e., don't send AIS alarms).
Note: TDM Tunneling is applicable only to E1/T1 interfaces.
[TDMoIPInitiateInviteTime
] Defines the time (in msec) between the first INVITE issued within the
same trunk when implementing the TDM tunneling application.
The valid value range is 500 to 1000. The default is 500.
Note: TDM Tunneling is applicable only to E1/T1 interfaces.
[TDMoIPInviteRetryTime] Defines the time (in msec) between call release and a new INVITE
when implementing the TDM tunneling application.
The valid value range is 10,000 to 20,000. The default is 10,000.
Note: TDM Tunneling is applicable only to E1/T1 interfaces.
Fax Signaling Method
fax-sig-method
[IsFaxUsed]
Global parameter defining the SIP signaling method for establishing and
transmitting a fax session when the device detects a fax.
You can also configure this feature per specific calls, using IP Profiles
(IpProfile_IsFaxUsed) and Tel Profiles (TelProfile_IsFaxUsed). For a
detailed description of the parameter, see Configuring IP Profiles on
page
404 and Configuring Tel Profiles on page 440.
Note: If this feature is configured for a specific IP Profile or Tel Profile,
the settings of this global parameter is ignored for calls associated with
the IP Profile or Tel Profile.
fax-vbd-behvr
[FaxVBDBehavior]
Determines the device's fax transport behavior when G.711 VBD coder
is negotiated at call start.

[0] = (Default) If the device is configured with a VBD coder (see the
CodersGroup parameter) and is negotiated OK at call start, then
both fax and modem signals are sent over RTP using the bypass
payload type (and no mid-call VBD or T.38 Re-INVITEs occur).

[1] = If the IsFaxUsed parameter is set to 1, the channel opens with
the FaxTransportMode parameter set to 1 (relay). This is required to
detect mid-call fax tones and to send T.38 Re-INVITE messages
upon fax detection. If the remote party supports T.38, the fax is
relayed over T.38.
Note:

If VBD coder negotiation fails at call start and if the IsFaxUsed
parameter is set to 1 (or 3), then the channel opens with the
FaxTransportMode parameter set to 1 (relay) to allow future
detection of fax tones and sending of T.38 Re-INVITES. In such a
scenario, the FaxVBDBehavior parameter has no effect.

This feature can be used only if the remote party supports T.38 fax
relay; otherwise, the fax fails.
[NoAudioPayloadType] Defines the payload type of the outgoing SDP offer.
The valid value range is 96 to 127 (dynamic payload type). The default
is 0 (i.e. NoAudio is not supported). For example, if set to 120, the
following is added to the INVITE SDP:
a=rtpmap:120 NoAudio/8000\r\n
Note: For incoming SDP offers, NoAudio is always supported.