AudioCodes Mediant 1000B User Manual page 927

User's Manual
Parameter
[TrunkTransferMode]
Version 6.8
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 (PRI/BRI) 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
message is received, the device performs a Blind Transfer by
executing a CAS Wink, dialing the Refer-to number to the
switch, and then releasing the call.

[4] = Supports QSIG Single Step transfer (PRI/BRI):
927
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 1000B Gateway & SBC