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Page 126 of 504 M 3900 description
553-3001-367 Standard 3.00 August 2005
M3900 Series Digital Telephones communicate with the CS 1000 and
Meridian 1 through digital transmission over standard twisted-pair wiring.
M3900 Series Digital Telephones can interface with all versions of the
Intelligent Peripheral Equipment (IPE) Digital Line Card (DLC). The DLC
supports 16 voice ports and 16 data ports. The system software assigns a TN
to each port in the system.
For more information on features and telephone operations, refer to the
following documents:
• Meridian Digital Telephones: M3901, M3902, M3903, M3904 User
Guide
• Meridian Digital Telephones: M3902, M3903, M3904 Quick Reference
Guide
• Meridian Digital Telephone: M3905 Call Center User Guide
Automatic Call Failover
The Active Call Failover (ACF) feature enables an M3900 Series Digital
Telephone to reregister in the ACF mode during a supported system failure.
The ACF mode preserves the following:
• active media stream
• LED status of the Mute, Handsfree, and Headset keys
• DRAM content
Note: All other elements (feature keys, soft keys and text areas) are
retained until the user presses a key or the connection with the Call
Server is resumed. If the user presses a key during the failover, the
display is cleared and a localized “Server Unreachable” message is
displayed.
The M3900 Series Digital Telephone uses this new mode of reregistration
only when the Call Server explicitly tells the telephone to do so. M3900
Series Digital Telephones clear all call information if they register to a Call
Server or Line Terminal Proxy Server (LTPS) that does not support the ACF
feature.