Version 6.4 669 March 2012
SIP User's Manual A. Configuration Parameters Reference
Parameter Description
interfaces) number from the originally dialed number.
Web: Transfer Prefix IP 2 Tel
[XferPrefixIP2Tel]
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 FXO/CAS blind transfer modes, i.e.,
LineTransferMode = 1, 2 or 3, and TrunkTransferMode = 1 or 3 (for
CAS).
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 the parameter XferPrefixIP2Tel to "*8"
and the parameter TrunkTransferMode to 5.
Web/EMS: Enable Semi-
Attended Transfer
[EnableSemiAttendedTransfe
r]
Determines the device behavior when Transfer is initiated while in
Alerting state.
[0] Disable = Send REFER with the Replaces header (default).
[1] Enable = Send CANCEL, and after a 487 response is
received, send REFER without the Replaces header.
Web: Blind
EMS: Blind Transfer
[KeyBlindTransfer]
Defines the keypad sequence to activate blind transfer for
established Tel-to-IP calls. The Tel user can perform blind transfer
by dialing the KeyBlindTransfer digits, followed by a transferee
destination number.
After the KeyBlindTransfer DTMF digits sequence is dialed, the
current call is put on hold (using a Re-INVITE message), a dial
tone is played to the channel, and then the phone number
collection starts.
After the destination phone number is collected, it is sent to the
transferee in a SIP REFER request in a Refer-To header. The call
is then terminated and a confirmation tone is played to the channel.
If the phone number collection fails due to a mismatch, a reorder
tone is played to the channel.
Note: For FXS/FXO interfaces, it is possible to configure whether
the KeyBlindTransfer code is added as a prefix to the dialed
destination number, by using the parameter
KeyBlindTransferAddPrefix.
EMS: Blind Transfer Add Prefix
[KeyBlindTransferAddPrefix]
Determines whether the device adds the Blind Transfer code
(defined by the KeyBlindTransfer parameter) to the dialed
destination number.
[0] Disable (default)
[1] Enable
Note: This parameter is applicable only to FXO and FXS
interfaces.
EMS: Blind Transfer Disconnect
Timeout
[BlindTransferDisconnectTim
eout]
Defines the duration (in milliseconds) for which the device waits for
a disconnection from the Tel side after the Blind Transfer Code
(KeyBlindTransfer) has been identified. When this timer expires, a
SIP REFER message is sent toward the IP side. If this parameter is
set to 0, the REFER message is immediately sent.
The valid value range is 0 to 1,000,000. The default is 0.
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