Alphatech Video Door IP Phone BOLD T4, 4 buttons The IP BOLD SIP intercom combines timeless alluminium design, modern technology , easy installation and maintenance. The IP BOLD door stations, IP intercoms family, offer two relay contacts, PoE, full duplex audio and a optional numerical dialling keypad. IP BOLD offers two additional virtual relays, which you can use with IP web relays. A suitable web relay, an external IP relay. See settings guide here. You can use audio softphone apps for Apple (iOS), Windows or Android such as iBell, ZoiPer, Linphone or 3CX. The IP BOLD is a 3CX compatible doorphone. It is used for seamless operation with 3CX IP PBX and 3CX audio softphones. Call up to 5 numbers / user accounts without using or programming any SIP server (IP PBX) We recommend using SIP based IP phone systems such as 3CX, Asterisk, Cisco Call Manager 10.x, Quadro Epygi QX IP PBX Each user can have up to 5 different numbers assigned, thus never missing an incomming call by pressing a call button, all your soft video phones or fixed IP video phones can start ringing no SIP server or IP PBX required for call group ringing your iPad/iPhone, Android smartphone/tablet, Windows PC and fixed HW IP audio phone can be ringing simultaneously or consecutively as you need just answer the audiocall by one of the softphones or fixed HW IP phones and start talking to the visitor at the door entrance Available models: Ref.230101 IP BOLD T1 audio with one call button Ref.230102 IP BOLD T2 audio with two call buttons Ref.230104 IP BOLD T4 audio with four call buttons Ref.230201 IP BOLD T1C video with one call button, colourcamera Ref.230202 IP BOLD T2C video with two call buttons, colourcamera Ref.230204 IP BOLD T4C video with four call buttons, colourcamera Ref.230301 IP BOLD TK1 audio with one call button and keypad Ref.230304 IP BOLD TK4 audio with four call buttons and keypad Ref.230401 IP BOLD TK1C video with one call button, keypad,colourcamera Ref.230404 IP BOLD TK4C video with four call buttons, keypad,colourcamera