The main function
1. the whole cord non-blocking exchange.
2.call display function (FSK and DTMF double system compatible).
3. automatic IP phone exhaled, cost savings.
4.exterior line incoming call can direct extension, can be recorded since the 2 section of the voice prompt.
5.breathe more level restrictions; Breathe out time limit; Dial the code limit limits; Password restrictions; Charter code restrictions.
6.can set a variety of flexible service function; Exhale hotline; Don't disturb busy callback; Displacement transfer; Busy a times; Answer the ringing, generation dial perimeter; Secretarial services;
Rp evictions outside threats music choice.
7.exchange can be flexible and simple configuration, its configuration is not affected by power outages, can keep unchanged for long.
Perimeter switch first to fourth extension of u of a power failure.
