AudioCodes Mediant 3000 User Manual page 902

Parameter
[TrunkTransferMode_x]
[EnableTransferAcrossTrunk
Groups]
User's Manual
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:
IP-to-Tel: When a SIP REFER message is received, the device
performs a transfer by sending a Facility message to the PBX,
initiating Single Step transfer. Once a success return result is
received, the transfer is completed.
Tel-to-IP: When a Facility message initiating Single Step transfer
is received from the PBX, a SIP REFER message is sent to the
IP side.

[5] = IP-to-Tel Blind Transfer mode supported for ISDN protocols
and implemented according to AT&T Toll Free Transfer Connect
Service (TR 50075) "Courtesy Transfer-Human-No Data". When
the device receives a SIP REFER message, it performs a blind
transfer by first dialing the DTMF digits (transfer prefix) defined
by the parameter XferPrefixIP2Tel (configured to "*8" for AT&T
service), and then (after 500 msec) the device dials the DTMF of
the number (referred) from the Refer-To header sip:URI
userpart.
If the hostpart of the Refer-To sip:URI contains the device's IP
address, and if the Trunk Group selected according to the IP to
Tel Routing table is the same Trunk Group as the original call,
then the device performs the in-band DTMF transfer; otherwise,
the device sends the INVITE according to regular transfer rules.
After completing the in-band transfer, the device waits for the
ISDN Disconnect message. If the Disconnect message is
received during the first 5 seconds, the device sends a SIP
NOTIFY with 200 OK message; otherwise, the device sends a
NOTIFY with 4xx message.

[6] = Supports AT&T toll free out-of-band blind transfer for trunks
configured with the 4ESS ISDN protocol. AT&T courtesy transfer
is a supplementary service which enables a user (e.g., user "A")
to transform an established call between it and user "B" into a
new call between users "B" and "C", whereby user "A" does not
have a call established with user "C" prior to call transfer. The
device handles this feature as follows:

IP-to-Tel (user side): When a SIP REFER message is
received, the device initiates a transfer by sending a Facility
message to the PBX.

Tel-to-IP (network side): When a Facility message initiating
an out-of-band blind transfer is received from the PBX, the
device sends a SIP REFER message to the IP side (if the
EnableNetworkISDNTransfer parameter is set to 1).
Note: For configuring trunk transfer mode per trunk, use the
parameter TrunkTransferMode_x.
Determines the trunk transfer mode per trunk (where x denotes the
Trunk number). For configuring trunk transfer mode for all trunks
and for a description of the parameter options, refer to the
parameter TrunkTransferMode.
Determines whether the device allows ISDN ECT, RLT or TBCT IP-
to-Tel call transfers between B-channels of different Trunk Groups.

[0] = (Default) Disable - ISDN call transfer is only between B-
channels of the same Trunk Group.

[1] = Enable - the device performs ISDN transfer between any
902
Description
Document #: LTRT-89738
Mediant 3000