When you receive an incoming call to your phone number, your other telephones (cell, home phone, car phone) will ring as well and the first one answered will be connected to the caller. Basically the call will be routed to all phone sets, which you will list in simultaneous ring option.
AiannaOne is a world wide service provider for the residential and Enterprise business, We offer unlimited and limited packages as well as customize PBX services based on your needs.