AudioCodes Mediant 2000 User Manual page 301

SIP User's Manual
Parameter
Web: Transfer Prefix
EMS: Logical Prefix For Transferred
Call
[xferPrefix]
Web: Transfer Prefix IP 2 Tel
[XferPrefixIP2Tel]
Web/EMS: Enable Semi-Attended
Transfer
[EnableSemiAttendedTransfer]
[KeyBlindTransfer]
EMS: Blind Transfer Add Prefix
[KeyBlindTransferAddPrefix]
Version 5.8
Defines the string that is added as a prefix to the
transferred/forwarded called number when the REFER/3xx
message is received.
Notes:

The number manipulation rules apply to the user part of
the REFER-TO/Contact URI before it is sent in the INVITE
message.

This parameter can be used to apply different
manipulation rules to differentiate transferred number from
the originally dialed number.
Defines the prefix that is added to the destination number
received in the SIP Refer-to header (for IP-to-Tel calls). This
parameter is applicable to
TrunkTransferMode = 3).
The valid range is a string of up to 9 characters. The default is
an empty string.
Note: This parameter is also applicable to ISDN Blind
Transfer, according to AT&T Toll Free Transfer Connect
Service (TR 50075) "Courtesy Transfer-Human-No Data". To
support this transfer mode, you need to configure
XferPrefixIP2Tel to "*8" and TrunkTransferMode to 5.
Determines the device behavior when Transfer is initiated
while in Alerting state.

[0] Disable = Send REFER with Replaces (default).

[1] Enable = Send CANCEL, and after a 487 response is
received, send REFER without Replaces.
Keypad sequence that activates blind transfer for Tel-to-IP
calls. There are two possible scenarios:

Option 1: After this sequence is dialed, the current call is
put on hold (using Re-INVITE), a dial tone is played to the
B-channel, and then phone number collection starts.

Option 2: A Hook-Flash is pressed, the current call is put
on hold, a dial tone is played to the B-channel, and then
digit collection starts. After this sequence is identified, the
device continues the collection of the destination phone
number.
For both options, after the phone number is collected, it's sent
to the transferee in a SIP REFER request (without a Replaces
header). The call is then terminated and a confirmation tone
is played to the B-channel. If the phone number collection
fails due to a mismatch, a reorder tone is played to the B-
channel.
Note: It is possible to configure whether the KeyBlindTransfer
code is added as a prefix to the dialed destination number, by
using the parameter KeyBlindTransferAddPrefix.
Determines whether the device adds the Blind Transfer code
(KeyBlindTransfer) to the dialed destination number.

[0] Disable (default).

[1] Enable.
301
6. Configuration Parameters Reference
Description
CAS Blind Transfer modes (
October 2009