Full IP system in a 48,3 cm ( 19 inch ) housing (black), 4 U, LAN connection, 3 free module slots for individual expansion of the system. Up to 16 VoIP channels (10 in the basic configuration, 6 more via a paid opt. license) , possible use: SIP external (SIP provider), SIP internal (SIP devices, AGFEO DECT IP), ASIP (AGFEO ST for IP interface), integrated voice box system incl. Voice to Mail (6 voice boxes in basic configuration, expandable to 60 via license), optional fax box system via license (fax reception including fax to mail, max. 6 fax boxes), audio information system (4-channel, optionally expandable to 7 channels via license), optional AMS per license, TAPI -Server functionality (optional license to increase the number of supported TAPI lines, 3 by default, max. 60), support SIP-TFE, door image display, support DECT-IP system with stored firmware versions for connected system telephones, configuration via LAN, SmartHome Server on Board including support for the SmartConnectBox (ext. relays and sensors). Optional expansion modules for analog devices, corded system telephony (S0, UP0, IP) as well as for additional IP channels (SIP external, SIP internal, ASIP, DECT-IP) and ISDN interfaces (external/internal S0). Depending on the firmware version and modules 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.