ISPhone are the ones to turn to for complete communication solutions. They specialise in IP telephony, fixed lines, mobile, and data services, along with a range of other communication services that will get your business operating more effectively.
The service for determining from which number a client has called. This helps to decide how to answer on the incoming call. A telephone company sends DNIS number to the telephone client’s system during establishing connection. As a rule, DNIS number consists from 4 to 10 digits.