Lars,

even telephone equipment that is connected to PBX only
has to be approved in the European countries. 

There is no electrical contact to the Public Network but
in any case there is a 'logical' one. 
For example:
-modems have to release the line after a specified time 
 when the carrier is lost
-handsets have to indicate incoming calls within a specified
 time after presentation of the ringing voltage
-dial timing (depends on the PBX)
and so on ..

Regards,
Karl
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[]   Karl-Heinz Doerfler
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|    ELSA GmbH             Tel.: +49/241-606-4656
|    Sonnenweg 11          Fax:  +49/241-606-1199
|    D-52070 Aachen        E-mail: [email protected]
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