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2 All About FRITZ!Card USB
13
Some ISDN PBX systems provide not only analog, but also digi-
tal extension lines, usually designated as internal S
0
interfaces.
ISDN terminal equipment can be connected to these digital
extensions as well as to the “external” S
0
interface provided by
the NT.
Whether you connect your FRITZ!Card USB to an internal or an
external S
0
interface, it is helpful to think of the ISDN applications
running on your computer — such as the FRITZ! software modules
FRITZ!data, FRITZ!fax and FRITZ!vox — as the terminal devices, not
the FRITZ!Card USB itself.
All incoming calls from ISDN lines are identified not only by the
MSN dialed, but also by a number indicating the requested
communications service (voice, data etc.). For incoming calls
originating from analog telephone networks, services are not
distinguished: these incoming telephone and fax calls both
arrive with the service indicator for voice telephony. For this
reason it is important to assign different MSNs to the various
FF
FF
F
RR
RR
R
ITZ!ITZ!
ITZ!ITZ!
ITZ! application modules and to your ISDN telephone or PBX
extensions to avoid conflicts. See the detailed configuration
instructions in the
FF
FF
F
RR
RR
R
ITZ!32 ITZ!32
ITZ!32 ITZ!32
ITZ!32 manual or in the on-line Help for
FF
FF
F
RR
RR
R
ITZ!32ITZ!32
ITZ!32ITZ!32
ITZ!32.
If you want to receive fax and data calls with your
FF
FF
F
RR
RR
R
ITZ!CarITZ!Car
ITZ!CarITZ!Car
ITZ!Car
dd
dd
d
UU
UU
U
SBSB
SBSB
SB, you do not need to assign separate MSNs to
FF
FF
F
RR
RR
R
ITZ!fax ITZ!fax
ITZ!fax ITZ!fax
ITZ!fax and
FF
FF
F
RR
RR
R
ITZ!dataITZ!data
ITZ!dataITZ!data
ITZ!data, since
FF
FF
F
RR
RR
R
ITZ!fax ITZ!fax
ITZ!fax ITZ!fax
ITZ!fax answers calls with the service
indicator for voice telephony while
FF
FF
F
RR
RR
R
ITZ!data ITZ!data
ITZ!data ITZ!data
ITZ!data responds to the
service indicator for data.
FF
FF
F
RR
RR
R
ITZ!fax ITZ!fax
ITZ!fax ITZ!fax
ITZ!fax and
FF
FF
F
RR
RR
R
ITZ!vITZ!v
ITZ!vITZ!v
ITZ!v
oo
oo
o
xx
xx
x, on the other hand, both use the same
service indicator.
FRITZ!fax and FRITZ!vox both respond to incoming calls for the voice
telephony service (“Audio 3.1 kHz”). If both of these FRITZ! modules
are to stand by for incoming calls at the same time, they must be
assigned MSNs that are different from each other and from those of
any telephones connected to the ISDN line.
13


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