AudioCodes Mediant 2000 User Manual page 464

Parameter
EMS: Options User Part
[OPTIONSUserPart]
Web: TDM Over IP Minimum
Calls For Trunk Activation
EMS: TDM Over IP Min Calls
For Trunk Activation
[TDMOverIPMinCallsForTru
nkActivation]
[TDMoIPInitiateInviteTime]
[TDMoIPInviteRetryTime]
Web: Fax Signaling Method
EMS: Fax Used
[IsFaxUsed]
SIP User's Manual
Defines the user part value of the Request-URI for outgoing SIP
OPTIONS requests. If no value is configured, the configuration
parameter 'Username' value is used.
A special value is 'empty', indicating that no user part in the Request-
URI (host part only) is used.
The valid range is a 30-character string. The default value is an empty
string ('').
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 value is 0 (i.e., don't send AIS
alarms).
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.
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.
Determines the SIP signaling method for establishing and transmitting
a fax session after a fax is detected.

[0] No Fax = No fax negotiation using SIP signaling. Fax transport
method is according to the parameter FaxTransportMode (default).

[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
464
Description
Document #: LTRT-68814
Mediant 2000