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Page 16 of 174 Functional description
553-3001-216 Standard 5.00 January 2002
• Virtual Office Enhancements (M3903 and M3904)
• Virtual Office Clearing of the Callers List and Redial List (M3903 and
M3904)
• Context Sensitive Soft Keys (M3905)
• Automatic Logout for Virtual Office
• Speed Call for Virtual Office
• System-Initiated Language Download
• Set-to-Set Messaging Enhancements
• Personal Directory fixed feature key
Full Duplex Handsfree
The Full Duplex Handsfree (FDHF) functionality allows simultaneous
two-way communication during a handsfree call. For Full Duplex Handsfree
functionality, you require an M3904 Phase III set equipped with an FDHF
cartridge.
Refer to “Full Duplex Handsfree” on page 52 for information on the FDHF
hardware requirements.
The receive audio level is attenuated during the FDHF mode while both
parties are speaking. Therefore, fluctuations in the receive volume can occur
during the FDHF call.
During a call, the FDHF cartridge can be inserted or removed from the ACM
without interrupting an established call. If the FDHF cartridge is removed,
half-duplex operation is restored.