8.2 Prerecorded Tones File
The Call Progress Tones (CPT) mechanism has several limitations such as a limited
number of predefined tones and a limited number of frequency integrations in one tone. To
overcome these limitations and provide tone generation capability that is more flexible, the
Prerecorded Tones (PRT) file can be used. If a specific prerecorded tone exists in the PRT
file, it takes precedence over the same tone that exists in the CPT file and is played instead
of it.
Note: The Prerecorded tones are used only for generation of tones. Detection of
tones is performed according to the CPT file.
The PRT is a *.dat file containing a set of prerecorded tones that can be played by the
device. Up to 40 tones (totaling approximately 10 minutes) can be stored in a single PRT
file on the device's flash memory. The prerecorded tones are prepared offline using
standard recording utilities (such as CoolEdit
TM
) and combined into a single file using
AudioCodes' TrunkPack Downloadable Conversion utility (refer to the Product Reference
Manual).
he raw data files must be recorded with the following characteristics:
Coders:
G.711 A-law or G.711 µ-law
Rate:
8 kHz
Resolution:
8-bit
Channels:
The generated PRT file can then be loaded to the device using AudioCodes' BootP/TFTP
utility or the Web interface (refer to ''Loading Auxiliary Files'' on page
mono
168).
The prerecorded tones are played repeatedly. This allows you to record only part of the
tone and then play the tone for the full duration. For example, if a tone has a cadence of 2
seconds on and 4 seconds off, the recorded file should contain only these 6 seconds. The
PRT module repeatedly plays this cadence for the configured duration. Similarly, a
continuous tone can be played by repeating only part of it.
To Next Page
Loading...
