Avaya 3900 Series User Manual page 75

Full Duplex Handsfree Accessory
The FDHF functionality requires the following hardware:
• Avaya 3904 Digital Deskphones Release 3 telephone set (NTMN34GA or later).
NTMN34TA is the Avaya 3904 Release 3 icon set that supports FDHF.
• Full Duplex Handsfree cartridge (NTMN72AA or later)
• Accessory Connection Module (NTMN71AA)
• 110V wall transformer to power the FDHF cartridge (NTMN80AA)
Avaya 3900 Series Digital Deskphones User Guide August 2010 75