Version 7.2 1247 Mediant 800B Gateway & E-SBC
User's Manual 72. Configuration Parameters Reference
Parameter Description
executing a CAS Wink, waits for an acknowledged Wink from the
remote side, dials the Refer-to number to the switch, and then
releases the call.
Note: A specific NFA CAS table is required.
[2] = Supports ISDN PRI/BRI transfer - Release Link Trunk (RLT)
(DMS-100), Two B Channel Transfer (TBCT) (NI2), Explicit Call
Transfer (ECT) (EURO ISDN), and Path Replacement (QSIG).
When a SIP REFER message is received, the device performs a
transfer by sending Facility messages to the PBX with the
necessary information on the call's legs to be connected. The
different ISDN variants use slightly different methods (using
Facility messages) to perform the transfer.
Note:
For RLT ISDN transfer, the parameter
SendISDNTransferOnConnect must be set to 1.
The parameter SendISDNTransferOnConnect can be used to
define if the TBCT/ECT transfer is performed after receipt of
Alerting or Connect messages.
For RLT, the transfer is always
done after receipt of Connect (SendISDNTransferOnConnect
is set to 1).
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/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/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
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