- Two detachable DECT wireless microphones with a range of up to 50 metres- Full-duplex hands-free talking- Wideband audio transmission- Bluetooth connectivity for two devices such as a mobile phone or a headset- Mute function on the telephone and microphones- Multi-coloured LEDs to indicate the status- Perfect for home-offices small companies and multi-room conference calls- Can be expanded with up to three C52-SP (1) wireless hands-free units- 3 SIP identities/accounts- Call lists for dialled received and missed calls with 200 entries- Local directory with 200 entries- Multiple language support- DTMF in-band / out-of-band and SIP-INFO- Interoperable with all major IP PBX platforms- Speed dialling- Local dial plan- Call waiting- Call blocking (automatic denial)- Hold- Call transfer- Call forwarding synchronised with the server do not disturb mode (DND)- CLIP CLIR- Conference calling with three participants