... compatible with telephones with a built-in amplifier. Some specific models: 3Com: 3102 &3103 Telephones Aastra: 2465, 2564, 480e ... Lazerbuilt: Prestige 905K, 906K, 907K MITEL: Superset 4000 Series, Models 4001, 4015, 4025, 4125, 4150, SuperConsole 1000, Mitel ... modules Optiset E Advance Optiset Advance Plus+ Headset Adapter Comfort 300E+ Headset Adapter Comfort F300E Optipoint 410 Standard & Advance ...