Frequently Asked Questions... What is the difference between a line and an extension? Lines are the individual telephone numbers that are provided by your local telephone company. Extensions are internal and allow the intercom buttons to be used to transfer calls. What is the difference between redial and recall? Redial calls the last telephone number you dialed. Recall provides a dial tone so you can make another call from the same phone, or, it can be used when you have call waiting. Recall is also referred to as the "flash" button. How can I order parts or new equipment for my phone system? Simply contact your DJJ Technologies Account Executive or call our offices at 1.800.355.2952. We can assist you in finding the parts and equipment you need.