Internal call functions Internal phone calls between extension to extension can be free dialing conveniently Incoming call functions You can receive any incoming calls by picking up the extension telephone set call pick-up An incoming call to an extension may be picked up from another extension. To pick up an Incoming call of another extension go off hook and dial * 9 and talk to the calling party outgoing call For outgoing call, you just pick up telephone set and dialing your target number directly call transfer function An established call can be transferred to another internal extension.There are two types of call Transfer, (1) blind transfer (2) consultation and transfer call forwarding function There are two types of call forwarding: internal and external, for either type, call forwarding is immediate. Hot line function Hotline is a feature that allows an extension ( programmed for hot line ) to automatically dial another extension or an external party, immediately the handset goes off hook. There are many applications for this feature. Connecting a fax machine, eftpos machine, door phone to extension ports or making a baby call are examples of hot line. With powerful routing function The system can be connected with the networks gsm/cdma/pstn/voip, and you can set the any telephone no. In the terminal and with least charging routing function With 4 exchange line and 4 extension ports The system can connect 1-4 analogue (slt) phones to tel ports and 1-4 exchange lines or other devices such as analogue telephone adaptors (atas ) or fixed wireless terminals (fwts ) to the line ports. With a mixture of mini pbx & a router It combines one mini pabx and a telephone router into one system Product specifications: Power supply: ac230va10% 50/60hz & ac110va10% Power consumption: n15w Ringing current: ac70va10% 50hz Environment temperature: 0-40 Humidity: 10%-90%