Version 6.6 583 October 2014
Installation & Operation Manual 40. General SIP Configuration
Parameter Name Type
Provisioning
Type
Description
When a SIP REFER
message is received, the
gateway performs a Blind
Transfer by executing a CAS
Wink, waits for an
acknowledge 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.
IDSN – Supports ISDN
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
gateway performs a transfer
by sending FACILITY
messages to the PBX with
the necessary information on
the call's legs that are to be
connected. The different
ISDN variants use slightly
different methods (using
FACILITY messages) to
perform the transfer.
CAS Normal – Supports CAS
Normal transfer. When a SIP
REFER message is received,
the gateway performs a Blind
Transfer by executing a CAS
Wink, dialing the Refer-to
number to the switch, and
then releasing the call.
QSIG – Supports QSIG
Single Step transfer: IP-to-
Tel: When a SIP REFER
message is received, the
gateway performs a transfer
by sending a FACILITY
message to the PBX,
initiating Single Step transfer.
Once a success return result
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