10.6.1. Feature Description 
For each service (DTE, FAX, VOICE), you can assign a forwarding destination
to a phone number. You cannot assign a forwarding destination to attendant
consoles and special stations. The different criteria for call forwarding
are explained in the following.
There are three different types of forwarding:
There are also the following types of call forwarding which are assigned
to the above-mentioned FWD types according to Table 57 on page
96, Forwarding types. You can program destinations for these.
- Unconditional call forwarding (FWD/CFU)
- Call forwarding if busy (CFB)
- Call forwarding if no response after timeout (CFNR)
- Call forwarding if do not disturb (CFDND)
IMPORTANT:
Call forwarding type CFDND: Do-not-disturb is a separate
feature that you activate with the do-not-disturb button on the station
device. If you want all calls to be forwarded in this state, configure
and activate a forwarding destination for SYSTEM in CFDND. This forwarding
runs only when do-not-disturb is activated.
Furthermore, there are two types of forwarding that do not have separate
destinations defined:
- Call deflection, forced forwarding (CD), always uses the CFNR destination. (This type of forwarding allows you to activate the FWD action during the call by pressing the FWD key or disconnect key on the telephone.)
- Delayed Call Forward Busy (DelCFB) always uses the CFB destination. (This type of forwarding has only been implemented for optiPoint telephones and requires the parameter DCFWBUSY. If this is set, camp-on automatically occurs at busy stations that are called and, after some time has expired, call forwarding on busy (CFB) occurs.)
Another possibility for some types of forwarding is to make a distinction
based on the type of incoming connection. For example, an external connection
is forwarded to a different destination than an internal incoming connection.
The following table illustrates the forwarding assignments
Table 55. Forwarding types
|
CFU
|
CFB
|
CFNR
|
CFBNR
|
CFDND
|
|
|
Variable
(IM and US)
|
INT
EXT
GEN
|
GEN
|
GEN
|
GEN
|
-----
|
|
Fixed
(not US)
|
GEN
|
-----
|
-----
|
-----
|
-----
|
|
System
(IM and US)
|
INT
EXT
GEN
|
INT
EXT
GEN
|
INT
EXT
GEN
|
------
|
INT
EXT
GEN
|
CFBNR defines only a common destination for CFB and CFNR but is not
a separate type of forwarding. "GEN" means the same destination for internal
and external calls.
IMPORTANT:
For functional terminals according to DSS1 protocol,
forwarded calls that are programmed according to the protocol are shown
under variable forwarding. For this reason, it is also not restricted
to only one variable forwarding destination at a given time the way other
station devices are (see Section 96.2.1,
"Variable Call Forwarding")
Important Information for USA
In the USA, only the variable and system FWD types are used. To keep
the fixed FWD out of the station device interface, you must set the parameter
for the user interface without fixed forwarding in the central system
data. As a result:
- The system does not offer fixed FWD in the optiPoint menu
- No FWD information is displayed when in the idle state
- FWD-LED signaling also occurs for the variable CFB and CFNR
When the system is delivered, the parameter CFUI is set to "YES".
Destinations can be:
- Configured subscribers and MASTER HT for each service
- Hunt group code for each service
- Personal station number of attendant console on voice
- Attendant console call queue (M key) only for voice
- Attendant group access code of attendant group
- Multiple code calling/paging with "meet me" (that is, you must configure search code and attendant code)
- Announcement via TCOM (adapter set for special equipment)
- Server for the particular service
- External destinations
There must be an allowed connection from the subscriber or MASTER HT to
the call forwarding destination. With the parameter ITRFWD, you can centrally
define whether there should be a check of the connection from the caller
to the forwarding destination when there is a call.
In principle, all call forwarding actions can be chained. You can
configure this centrally with parameters.
You must provide enough memory for the forwarding destinations.