17.25. FWDN - Release rerouting for network-wide call forwarding
to source node 
Feature:
Network-wide call forwarding (FWD)
Follow-me with network-wide PIN
Function:
The FWDN parameter is used in the COT of a trunk on the one hand to execute network-wide
call forwarding and, on the other, to release rerouting for network-wide call forwarding
to
the source node. This applies to network-wide call forwarding that can arise from
an A-B
connection or from a consultation line prior to transfer.
If the FWDN parameter is set in the incoming, busy trunk of the called node or in
the
incoming busy trunk of a transit node, then the update or connection data is forwarded
to
the next node for execution of call forwarding until a node is found in the network
which
undertakes the activities for returning call forwarding in a forward direction. This
can be
either a transit node or the source node.
If the FWDN parameter is not set in the incoming busy trunk of the called node or
in the
incoming busy trunk of a transit node, then no update or connection data for executing
call
forwarding is forwarded to the next node. The trunk becomes the return point and takes
on
the control activity for the subsequent connection setup for network-wide call forwarding
to
the FWD destination and ensures the forward release of the connection to the B station.
The FWDN parameter should also be set as standard for the outgoing busy trunks that
are
seized while a connection is being set up between a calling node, a called node and
the
intermediate transit nodes, provided that the network protocols permit rerouting for
call
forwarding. This is how rerouting works for call forwarding from node B to node A
and vice
versa.
IMPORTANT:
Trunk parameter FWDN must not be set on the digital network interface
points from a OpenScape 4000 to older Hicom 300 variants and to external systems that
do not
support this function!
IMPORTANT:
Trunk parameters FWDN, FNAN and CFVA may not be set, for example, in
OpenScape 4000 with network couplings with external systems without rerouting function
for
call forwarding, CORNET with HICOM 100, CorNet NQ with ATM, Ethernet, ....MUX... in
transfer
networks and on the system connection due to undefined T reference point functions
(network
side).
AMO Interrelationships:
COT Classes of Trunks:
FNAN: Enable rerouting for network-wide call forwarding to source node
FWDR: Call deflection to public CO via rerouting (France)
CFVA: Network-wide connectivity test for forwarding destination when programming an
FNA/FWD
forwarding destination via tie trunk circuits
Device types:
Digital CO trunk circuits, interface circuits and tie trunk circuits
For example, SOCOD, S2COD, SOCONN, S2CONN, etc.
Analog networking interface circuits and tie trunks
For example, MAINEM, SATEM
Protocol variants:
Protocols that support rerouting for call forwarding to the source node in the network:
|
Protocol variants
|
Brief description
|
|
ANALOG
|
Protocols for analog trunks
|
|
CORNV2
|
Cornet protocol
|
|
CORNV2R
|
Cornet protocol
|
|
CORNV3
|
Cornet protocol
|
|
CORNV3R
|
Cornet protocol
|
|
CORNV33
|
Cornet protocol
|
|
CORNV33R
|
Cornet protocol
|
|
ECMA1
|
ECMA QSIG V1 protocol
|
|
ECMA1R
|
ECMA QSIG V1 protocol
|
|
ECMAV2
|
CorNet-NQ Issue 2.1 Dec. 96 Basic ETSI
|
|
ECMAV2R
|
QSIG ETSI ETS 300 172 3rd. with SS 2nd.
|
|
PSS1V2
|
CorNet-NQ Issue 2.1 Dec. 96 Basic ISO/IEC
|
|
PSS1V2R
|
QSIG ISO ISO/IEC 11572 2nd. with SS
|
|
EDSGER
|
EDSS1 protocol for Germany
|
|
ETSI
|
Standard EURO-ISDN
|