American Access Systems Phonelink 50 The American Access Systems, Phone Link 50 telephone entry system is constructed using a heavy gauge, powder coated enclosure, stainless steel faceplate and is designed to be either post or surface mounted.Functions available with the Phonologic 50 allow the user to conveniently screen entrants from the security of a telephone inside the home office. When a guest presses the call button, a double ring alerts the people inside that someone is a the gate, rather than an incoming telephone call. Access is allowed by simply pressing ** for a momentary relay operation, or *# to latch the gate open. The gate can be called and latched open without a guest being present at he gate. This system features a "one-shot" code, which enables the user to safely give out a code for one time use only. Additional features include call waiting, a manual overdrive providing phone switch in the event of damage to the telephone entry unit and an optional pinhole camera for additional security. For guest with pre-authorized entry, a fully programmable 50 code keypad is provide. The PhoneLink 50 telephone entry is "No Phone Line" telephone entry system, allowing you to use your existing telephone line without creating an addition to the phone bill.