AudioCodes Mediant 2000 User Manual page 557

SIP User's Manual
Parameter
[EarlyAnswerTimeout]
Web/EMS: Trunk Transfer Mode
[TrunkTransferMode]
Version 6.4
information.
Note: This capability is applicable only to the NI-2 ISDN
variant.
Defines the time (in seconds) that the device waits for an ISDN
Connect message from the called party (Tel side) after sending
a Setup message. If the timer expires, the call is answered by
sending a SIP 200 OK message (IP side).
The valid range is 0 to 600. The default value is 0 (i.e.,
disabled).
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
557
A. 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]
November 2011