Page16 of 174 Functionaldescription
553-3001-216 Standard 5.00 January2002
• VirtualOffice Enhancements (M3903 and M3904)
• Virtual Office Clearing of the Callers List and Redial List (M3903 and
M3904)
• ContextS ensitive Soft Keys (M3905)
• Automatic Logout for Virtual Office
• SpeedCall for Virtual Office
• System-InitiatedLanguage Download
• Set-to-SetMessaging Enhancements
• PersonalDirectory fixed feature key
Full Duplex Handsfree
TheFull Duplex Handsfree (FDHF) functionality allows simultaneous
two-waycommunication during a handsfree call. For Full Duplex Handsfree
functionality,you require an M3904 Phase III set equipped with an FDHF
cartridge.
Referto “Full Duplex Handsfree” on page 52 for information on the FDHF
hardwarerequirements.
Thereceive audio level is attenuated during the FDHF mode while both
partiesare speaking. Therefore, fluctuations in the receive volume can occur
during the FDHF call.
Duringa call, the FDHF cartridge can be i nsertedo r removed from the ACM
without interrupting an established call. If the FDHF cartridge is removed,
half-duplexoperation is restored.