System in a plastic wall housing with up to 12 VoIP channels (6 in the basic configuration, 6 more via a paid optical license), 2 digital ports (optionally ext. S0/int. S0/Up0), 4 UP0 ports, 8 analogue connections (incl . CLIP function, a/b TFE operating mode possible) and LAN connection for up to 25 users. SIP internal, SIP external, customizable MoH, integr. Voice box system including voice to mail (6 voice boxes in the basic configuration, expandable to 18 via license), fax box system via license (fax reception including fax to mail, max. 3 fax boxes), audio information system (1-channel, optionally via license expandable to 4 channels), optional call management system (AMS) per license, TAPI server functionality (optional license to increase the number of supported TAPI lines, 3 by default, max. 20), support SIP-TFE, door image display, Support for DECT IP system, TK-Suite Server ES on board, configuration via LAN, CTI software TK-Suite Client ES, SmartHome Server on board including support for the SmartConnectBox (ext. relays and sensors). Integrated update server with stored firmware versions for connected System telephones, operation of AGFEO ST 21, ST 22, ST 40, ST 42, ST 45, ST 22 IP, ST 40 IP, ST 42 IP, ST 45 IP in the current. Firmware release possible. Sales unit: 1 ST.