AudioCodes Mediant 8000, Installation, Operation & Maintenance Manual

Page: 584 / 924

Installation & Operation Manual 584 Document # LTRT-92224
Mediant 8000
Parameter Name Type
Provisioning
Type
Description
is received, the transfer is
completed.

IP-to-Tel Blind Transfer
mode supported for ISDN
PRI/BRI protocols and
implemented according to
AT&T Toll Free Transfer
Connect Service (TR 50075)
"Courtesy Transfer-Human-
No Data". When the board
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
board 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 board'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 board performs
the in-band DTMF transfer;
otherwise, the board sends
the INVITE according to
regular transfer rules.After
completing the in-band
transfer, the board waits for
the ISDN Disconnect
message. If the Disconnect
message is received during
the first 5 seconds, the board
sends a SIP NOTIFY with
200 OK message; otherwise,
the board sends a NOTIFY
with 4xx message.

4ESSFreeOOBBlindTransfer
- Supports AT&T Toll Free
Out-Of-Band blind transfer
for 4ESS protocol.