User's Manual 558 Document #: LTRT-68822
Mediant 2000
Parameter Description
URI (host part only) is used.
The valid range is a 30-character string. The default is an empty string
(‘’).
Web: TDM Over IP
Minimum Calls For Trunk
Activation
EMS: TDM Over IP Min
Calls For Trunk Activation
[TDMOverIPMinCallsFor
TrunkActivation]
Defines the minimal number of SIP dialogs that must be established
when using TDM Tunneling to consider the specific trunk as 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).
[TDMoIPInitiateInviteTim
e]
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.
[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.
Web: Fax Signaling
Method
EMS: Fax Used
[IsFaxUsed]
Determines the SIP signaling method for establishing and transmitting a
fax session after a fax is detected.
 [0] No Fax = (Default) No fax negotiation using SIP signaling. Fax
transport method is according to the parameter FaxTransportMode.
 [1] T.38 Relay = Initiates T.38 fax relay.
 [2] G.711 Transport = Initiates fax/modem using the coder G.711 A-
law/Mu-law with adaptations (see Note below).
 [3] Fax Fallback = Initiates T.38 fax relay. If the T.38 negotiation
fails, the device re-initiates a fax session using the coder G.711 A-
law/µ-law with adaptations (see the Note below).
Notes:
 Fax adaptations (for options 2 and 3):
Echo Canceller = On
Silence Compression = Off
Echo Canceller Non-Linear Processor Mode = Off
Dynamic Jitter Buffer Minimum Delay = 40
Dynamic Jitter Buffer Optimization Factor = 13
 If the device initiates a fax session using G.711 (option 2 and
possibly 3), a 'gpmd' attribute is added to the SDP in the following
format:
For A-law: 'a=gpmd:8 vbd=yes;ecan=on'
For µ-law: 'a=gpmd:0 vbd=yes;ecan=on'
 When this parameter is set to 1, 2, or 3, the parameter
FaxTransportMode is ignored.
 When this parameter is set to 0, T.38 might still be used without the
control protocol's involvement. To completely disable T.38, set
FaxTransportMode to a value other than 1.
 This parameter can also be configured per IP Profile (using the
IPProfile parameter).
 For more information on fax transport methods, see 'Fax/Modem
Transport Modes' on page 156.
[HandleG711asVBD]
Enables the handling of G.711 as G.711 VBD coder.
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