Manual Voice Server Espero © Vidicode 2009
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case of a malfunction. Yet another application of the Ethernet
connection is to set the clock using NTP (Network Time Protocol).
The Call Recorder Access System software can be used to connect to the
Voice Server over the network to retrieve voice mail and recorded calls
and archive them on the PC. The Call Recorder Access system can present
the call statistics assembled by the Espero in the form of bar charts. The
Call Recorder Access System software has extensive archiving capabilities
including the creation of special archives suited for backup on CD. A
special version of the Call Recorder Access System allows for fax image
recovery of recorded fax transmissions.
1.4
Search voice mail
The Espero has a search function to find and play specific voice mail and
(if the Call Recorder option is used) Recorded Calls. They can be searched
for according to date, local or remote telephone number and line
number. The system has an internal speaker for playback of recordings.
1.5
Pass through connection system
A Voice Server will be connected between the public telephone network
and your telephone system. All ISDN channels pass through the internal
bus of the Espero and it can take control at any time. Pass Through is
also occasionally called In-Line.
As a consequence of the pass through connection the Espero can also
intercept the D-channel and therefore control signalling between the
telephone system and the network. This is used to filter numbers sent by
the PBX so that they are not sent to the line.
It can be used to capture commands from the user to the recorder which
has several applications that will be explained in this manual.
Because of pass through mode the Espero is equipped with loop-
through relays to prevent disrupting telephone communication in case
of a power failure or another malfunction. The loop-through relays then
close to fall back into passive mode and ongoing telephone calls are not
disconnected.
1.6
Audio compression for recording
The Espero has compression facilities on board to compress recordings
according to the G.723.1 format. Compression is only used for call
recording because it will accumulate a huge amount of data. G.723.1
compression has a good balance between audio quality and recording
size and can be reproduced on most PC’s with Microsoft Windows.
Compressed recordings take up 1/10th of the size of uncompressed
recordings. Therefore the compression has a profound effect on the
storage capacity in terms of recording time.
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