AudioCodes Mediant 3000 User Manual page 901

User's Manual
Parameter
Web/EMS: Trunk Transfer
Mode
[TrunkTransferMode]
Version 6.8
settings of this global parameter is ignored for calls associated with
the IP Profile.
Determines the trunk transfer method (for all trunks) when a SIP
REFER message is received. The transfer method depends on the
Trunk's PSTN protocol (configured by the parameter ProtocolType)
and is applicable only when one of these protocols are used:
PSTN Protocol
E1 Euro ISDN [1]
E1 QSIG [21],
T1 QSIG [23]
T1 NI2 ISDN [10],
T1 4ESS ISDN [11],
T1 5ESS 9 ISDN [12]
T1 DMS-100 ISDN [14]
T1 RAW CAS [3], T1
CAS [2], E1 CAS [8],
E1 RAW CAS [9]
T1 DMS-100 Meridian
ISDN [35]
The valid values of this parameter are described below:

[0] = Not supported (default).

[1] = Supports CAS NFA DMS-100 transfer. When a SIP
REFER message is received, the device performs a Blind
Transfer by executing a CAS Wink, waits for an acknowledged
Wink from the remote side, dials the Refer-to number to the
switch, and then releases the call.
Note: A specific NFA CAS table is required.

[2] = Supports ISDN transfer - Release Link Trunk (RLT) (DMS-
100), Two B Channel Transfer (TBCT) (NI2), Explicit Call
Transfer (ECT) (EURO ISDN), and Path Replacement (QSIG).
When a SIP REFER message is received, the device performs a
transfer by sending Facility messages to the PBX with the
necessary information on the call's legs to be connected. The
different ISDN variants use slightly different methods (using
Facility messages) to perform the transfer.
Notes:

For RLT ISDN transfer, the parameter
SendISDNTransferOnConnect must be set to 1.

The parameter SendISDNTransferOnConnect can be used
to define if the TBCT/ECT transfer is performed after receipt
of Alerting or Connect messages. For RLT, the transfer is
always done after receipt of Connect
(SendISDNTransferOnConnect is set to 1).

This transfer can be performed between B-channels from
different trunks or Trunk Groups, by using the parameter
EnableTransferAcrossTrunkGroups.

The device initiates the ECT process after receiving a SIP
REFER message only for trunks that are configured to User
side.

[3] = Supports CAS Normal transfer. When a SIP REFER
901
51. Configuration Parameters Reference
Description
Transfer Method (Described Below)
ECT [2] or InBand [5]
Single Step Transfer [4], Path
Replacement Transfer [2], or InBand [5]
TBCT [2] or InBand [5]
RTL [2] or InBand [5]
[1] CAS NFA DMS-100 or [3] CAS
Normal transfer
RTL [2] or InBand [5]
Mediant 3000