Operation Manual

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2 All About FRITZ!Card USB

Some ISDN PBX systems provide not only analog, but also digi-

tal extension lines, usually designated as internal S

interfaces.

ISDN terminal equipment can be connected to these digital

extensions as well as to the “external” S

interface provided by

the NT.

Whether you connect your FRITZ!Card USB to an internal or an

external S

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

ITZ!ITZ!

ITZ! application modules and to your ISDN telephone or PBX

extensions to avoid conflicts. See the detailed configuration

instructions in the

ITZ!32 ITZ!32

ITZ!32 manual or in the on-line Help for

ITZ!32ITZ!32

ITZ!32.

If you want to receive fax and data calls with your

ITZ!CarITZ!Car

ITZ!Car

SBSB

SB, you do not need to assign separate MSNs to

ITZ!fax ITZ!fax

ITZ!fax and

ITZ!dataITZ!data

ITZ!data, since

ITZ!fax ITZ!fax

ITZ!fax answers calls with the service

indicator for voice telephony while

ITZ!data ITZ!data

ITZ!data responds to the

service indicator for data.

ITZ!fax ITZ!fax

ITZ!fax and

ITZ!vITZ!v

ITZ!v

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.