17.24. FNAN - Enable rerouting for network-wide forwarding on
no answer to source node 
Feature:
Network-wide forwarding on no answer (FNA)
Call Deflection (CD) - call forwarding during the ringing phase
Function:
The FWDN parameter is used in the COT of a trunk on the one hand to deactivate the
return
point for executing 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, seized trunk of the B node or in the
incoming
seized 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 cell 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 seized trunk of the B node or in
the
incoming seized 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
subscriber.
The FWDN parameter should also be set as standard for the outgoing seized trunks that
are
seized while a connection is being set up between a calling node, a called node and
the
intermediate transit node, 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
verse.
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!
Cell Deflection (CD) - call forwarding during the ringing phase
The CD LM allows a subscriber to deflect incoming connections to a different connection
during call signaling - after CD has been activated.
The COT parameter FNAN is used to determine whether the service is released on the
relevant
trunk and whether the external system has implemented the service.
IMPORTANT:
Trunk parameters FWDN, FNAN and CFVA must not be
set, for example, in OpenScape 4000 with network couplings with external systems without
rerouting function for call forwarding on no answer, CORNET with HICOM 100, CorNet
NQ with
ATM, Ethernet,....MUX... in transfer networks, on the system connection due to undefined
T
reference point functions (network side).
AMO Interrelationships:
COT Classes of Trunks:
FWDN: Enable rerouting for network-wide call forwarding to source node
NCTP: The partner node cannot execute network-wide call forwarding after transfer
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.
Protocol variants:
Protocols that support rerouting for network-wide call forwarding to the source node:
|
Protocol variants
|
Brief description
|
|
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
|