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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 11 | Optional Software en | 481
61.6 Operation
Making calls via the PC Telephone Interface Client
requires the user to follow a voice response menu. The
PC Telephone Interface uses predefined calls defined in the
PC Call Server to select call properties. These calls are
always partial. The live speech phase of a PC Telephone
Interface call is recorded first and broadcast after the call
has been completed successfully.
The soundcard audio output of the PC running the
PC Telephone Interface is coupled to an audio input of the
Praesideo system if calls with live speech will be made.
Make sure that all predefined calls with live speech that
are to be used by telephone have this audio input
configured as live speech input.
This means that predefined calls that are to be used by
both PC Call Station Clients and PC Telephone Interface
Clients should not contain live speech, since these clients
use different Preaesideo audio inputs for live speech. If
this predefined call should contain live speech, then two
almost identical versions of this predefined call (with
different names) should be configured for the PC Call
Server, one for the PC Call Station Client with e.g. a call
station microphone as input, the other for the
PC Telephone Client with a line input configured as live
speech source and connected to the PC soundcard
output.
Configure port number 5060 for the PC Telephone
Interface Client for direct access via a softphone, like
ZoIPer (www.zoiper.com).
61.7 Voice response menu
A voice response menu guides the caller to enter the
data, required to make a call. For this purpose a number
of different gsm-files are available in English. The
gsm-file format is typically used for this kind of
telephone applications. It is a compressed sound file
format. The user or installer can replace these sound
files with files that are more convenient for the intended
users, e.g. in the local language, more talkative or more
condensed. For this purpose sound file editors and
converters are available on the Praesideo distribution
DVD. With these editors (e.g. WavePad, Audacity) a
recording can be made in the uncompressed wav-file
format. Then these files can be normalised to maximum
level and/or optimised in other ways for good
intelligibility. It is recommended to use a high pass filter
to remove frequencies below 300 Hz, as these low
frequencies severely decrease intelligibility of the
gsm-files. Finally the files must be converted (using SoX
or WavePad) to the gsm-file format at 8kHz sample rate.
The names as indicated in table 61.1 should be used,
because the PC Telephone Interface Client expects to find
these. Do not translate or change these file names.
Command line conversion from wav-file format to
gsm-file format via SoX is as follows:
sox.exe "<Source filename>.wav" -r 8000 "<Destination
filename>.gsm"
Because the telephone interface is based on the Asterisk
telephony platform, which is designed to run on Linux,
a Cygwin environment is installed on MS Windows and
the sound files are located in the folder
\<AsteriskRoot>\var\lib\sounds. This is usually
C:\cygroot\asterisk\var\lib\sounds.