Full IP system in a 48,3 cm ( 19 inch ) housing (black) with up to 16 VoIP channels (10 in the basic configuration, 6 more via a paid optical license), 1 U, all ports and interfaces accessible from the front (via RJ45). 2 Digital ports (optionally ext. S0/int. S0/Up0), 4 UP0 ports, 4 analog connections (incl. CLIP function, a/b TFE operating mode possible) and LAN connection for the digital ports via LED, internal SIP, external SIP , customizable MoH, integrated voice box system including voice to mail (6 voice boxes in the basic configuration, expandable to 30 via license), optional fax box system via license (fax reception including fax to mail, max. 6 fax boxes), audio information system ( 1-channel, optionally expandable to 4 channels via license), optional call management system expansion via license, TAPI server functionality (optional licenses to increase the supported TAPI lines of 3 by default to a maximum of 40 and CSTA expansion ), support SIP-TFE, door image display, support DECT IP system, configuration via LAN, SmartHome Server on board incl. support of the SmartConnectBox (ext. relays and sensors). Integrated update server with stored firmware versions for connected system telephones. Depending on the firmware version used, operation of the following system telephones is possible: ST 21, ST 22 (IP), ST 40 (IP), ST 42 (IP), ST 45 (IP), ST 53 (IP), ST 54 IP and ST 56 (IP). AGFEO Dashboard Server (on board) for CTI/UC functionality can be permanently activated via an optional license (demo operation possible), CTI/UC control and operating software AGFEO Dashboard incl. possible. VISOfon functionality (optional license extension).