CHAPTER68 Configuration Parameters Reference
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
■ [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.
✔ 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: To configure trunk transfer mode per trunk, use the
parameter TrunkTransferMode_x.
[TrunkTransferMode_x] Determines the trunk transfer mode per trunk (where x denotes
the Trunk number). To configure trunk transfer mode for all
trunks and for a description of the parameter options, refer to the
parameter TrunkTransferMode.
[EnableTransferAcrossTru
nkGroups]
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.
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