APT-31 Plantronics 37820-11 EHS Cable for Tenovis desk phones replaces APT-30 making it compatible with the On-Line Indicator

APT-31 37820-11 Electronic Hook Switch Cable (CS500/Savi) for Tenovis desk phones replaces APT-30 making it compatible with the Plantronics On-Line Indicator. Compatible with Tenovis T3 Classic with Interface Adapter, T3 IP Classic, T3 IP II Classic, T3 IP Classic with Interface Adapter, TH13, TM13, TS13, T3 Compact, T3 IP Comfort, T3 IP II Comfort, OS 13, OS33