This example shows how to configure a LANCOM when a downstream ISDN PBX is enhanced with VoIP telephony capability. Until now, the MSNs '11' to '13' for the ISDN connection have been used for two ISDN telephones and one analog fax. The LANCOM will now be switched between the public ISDN connection and the ISDN PBX.
Note: The PBX is configured to allow subscribers to receive immediate
access to an outside line when they pick up the receiver.
This ISDN PBX is operated as a downstream PBX on the ISDN NT interface of the LANCOM.