EVM Modules of the MS Series Technical Introduction and User’s Guide
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TECHNICAL INTRODUCTION
GENERAL INTRODUCTION OF THE EVM MODULES
The EVM modules are the optional Auto Attendant (ACD- Automatic Call
Distributor) and voice recording systems that are utilized in MS-series
exchanges of MS38S and higher capacity.
Each EVM module possesses permanent message capacity. However, that
capacity can be increased by employing auxiliary expansion modules when
necessary. These modules are called EVM-FL (Flash Memory) and EVM-DL
(DRAM Memory).
Recording of the messages to be used for the ACD are done into the non-
volatile memories (Flash Memory) on the EVM modules, so that those
messages are not erased in case of any blackout. On the other hand, the
voice mail messages that are to be recorded into the voice mail message
boxes allocated to the extensions are stored in the volatile memories (DRAM
Memory), hence, they are erased during a blackout.
The ACD and voice mail message boxes are present in all EVM modules. In
addition to those, the feature of the system messages is also present in
EVM128S and EVM224S modules only, in order to present additional services
to users. Thanks to the system messages, users are informed by voice mail
messages about statuses of their phones and the authorizations they have
been granted for several services. The system messages are saved into the
non-volatile memories as well, and they are not erased in case of any
blackout, either.
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