What is DID Number Service?
A DID number service provider caters you with a telephone number that works over VoIP with SIP features and solutions. With this service, you will be able to receive calls from users taking use of IPBX or SIP phones. These are virtual numbers that allow you to route all the calls to/from existing telephone lines. DID Number concept came into existence to ensure that a number of employees could be assigned a direct number without having the need of multiple physical phone lines.