Call logs include the date when you have called, the telephone number to which you called and the duration of the conversation. You can also add notes to the call log. You can review call logs by the telephone.
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.