AudioCodes Mediant 800 User Manual page 1397

CHAPTER 72 Configuration Parameters Reference
Parameter
Mediant 800 Gateway & E-SBC | User's Manual
✔
This transfer can be performed between B-channels
from different trunks or Trunk Groups, by using the
parameter EnableTransferAcrossTrunkGroups.
✔
The device initiates the ECT process after receiving a
SIP REFER message only for trunks that are
configured to User side.
■ [3] = Supports CAS Normal transfer. When a SIP REFER
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 PRI and BRI:
✔
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 PRI
and BRI 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.
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Description