A story like ISDN to everyday life was those which were converted on ISDN technology using a PABX with a Forderma support acquisition by Deutsche Telekom, so it gave it 200 EUR for the renewal of the ISDN connection, until 1997 were and $400 were paid for the purchase of the ISDN PABX. The T-com product AON complete, that was the first Austrian Internet Flatrate, obtained in the winter of 1999 in Austria a spending spree of ISDN installations. If one en wishes analogue end devices such as modem, answering machine, fax or telephone to an ISDN output then you need for example an ISDN PABX that has analog auxiliary lines. Negativity of conventional ISDN PBX system compared to a conventional analog connection is that the operation of the corded phone is not intended without power supply. A PrimarmultiplexAnschluss with 10 commercial channels, a control channel and a channel for maintenance and synchronization is used to output an ISDN telephone system. An ISDN PABX is connected to the NTPM or NTBA on the front in anyway only one ISDN device can be connected. in 2002 the number of ISDN telephone systems increased in Austria on a total 438000.

The cable length of the ISDN system to the NTBA can be 500 to 1000 meters long according to the used cable type. Call-through the Durchrufsparwahl for mobile phone allows in ISDN PBX systems and call the PABX provides an Office Access. ISDN telephone systems allow with call back the PABX recall for example the mobile phone and provides an Office Access. A least LCR, brings the advantage that telephony abroad cheaper runs together with an ISDN system. A modern ISDN PBX should offer many features.

Au EI offer good ISDN PBX connections for four devices that are analog, and connections up to four VOIP phones that require no power supply. Special equipment can be a VOIP telephone and an analog then use the phone jacks en, more via screw terminals. TK allow attachments with a PC connected via USB 2.0 cable. Most of the time a musical number, which may be four minutes long in the ISDN telephone system, with switchable outgoing message, as WAV file from the computer and is loaded. Not to be forgotten is the Chief secretariat function of an ISDN telecommunications system with flexible head.-sec mapping. Private Office Access, which can be use with. personal password, is there in ISDN equipment, in addition to the possible use of all NT s. Flexibility is called for when ISDN telephone systems by telephony, which is computerised network for Apple Mac OS. Serious ISDN PBX systems have an audio input, the input sensitivity is adjustable for external music number, medium a mono jack. There are ISDN PBX systems, which have up to twenty VoIP accounts at the same time. Voice quality wise some TK systems on through comfort noise generation, short CNG, and echo compensation. At TK the cost information is beneficial plants at the end of the conversation.