Section 365.175 - Emergency telephone number 911 private branch exchange-private switch automatic location identification(1) DEFINITIONS.-As used in this section, the term: (a) "Automatic location identification" or "ALI" means the automatic display at the Public Safety Answering Point (PSAP) of the caller's telephone number, the address or location of the telephone, and supplementary emergency services information.(b) "Automatic location identification retrieval" or "ALI retrieval" means the process of querying the 911 database for ALI records.(c) "Automatic number identification" or "ANI" means the telephone number associated with the access line from which a call originates.(d) "Private branch exchange" or "PBX" means a private telephone system that is connected to the Public Switched Telephone Network (PSTN).(e) "Private switch ALI" or "PSA" means a service option which provides enhanced 911 features for telephone stations behind private switches, e.g., PBX's.(2) REQUIRED ALI CAPABILITY.-Each PBX system installed after January 1, 2004, must be capable of providing automatic location identification to the station level.