Connection 

There are different types of connecting a Konftel to a telephone line.

POTS	Analogue public telephone line, common in the home or PBX with an analogue card. Konftel 100, Konftel 200, Konftel 200NI, Konftel 250 and Konftel 300.
DECT/GAP	Wireless connection to a DECT system. After registering the Konftel 200W it gets an extension in your PBX. Konftel 50/60W and Konftel 300 connects via a cable to a wireless DECT phone.
ISDN/So	Digital public telephone line, commonly called ISDN Duo, or PBX with ISDN/So card. Konftel 200NI.
Digital line	Line specific for the actual PBX type/brand. This requires a special/specific brand of telephone for the respective PBX type. Konftel 50, Konftel 60W and Konftel 300.
VoIP	Voice communication with an Internet Protocol. Konftel 50/60W and Konftel 300 connects to  computers equipped with software for IP SoftPhone, regardless of protocol i.e. SIP, Skype, H.323.
Mobile GSM	Wireless connection to system or mobile phone or PC with Bluetooth - Konftel 60W. Connection with cable to system phone or PC. Also for connection to mobile phone and DECT phone. Konftel 50, Konftel 60W and Konftel 300.