The jabra gn1210 straight rj 9 cord is the solution to a common problem of not being able to connect headset and carbon based telephone even though most things have been standardized the cord connecting the carbon based phone with the handset or headset is anything but standard as each telephone manufacturer has its own wiring code now with the universal smart cord gn 1210 the cord will work with virtually any carbon based phone system providing greater convenience available in both str