GF Series - Audio Only with Individual Call Buttons Updated on June 9th, 2026 This station is discontinued and may no longer be supported. These instructions are provided to assist with operation and maintenance, and to guide upgrade paths.GF Series with Trunk Line:Download Home Run Wiring Setup: Download GF Series - Audio Only with Individual Call Buttons GF Series - Audio Only System with Digital Display and Keypad GF Series - Video with Individual Call Buttons GF Series - Video with GF-4Z and Digital Display and Keypad GF Series External Signaling intercom audio