MP-1xx SIP User’s Manual 7. Configuration Files
Version 4.4 147 March 2005
7.2 Prerecorded Tones (PRT) File
The Call Progress Tones mechanism has several limitations, such as a limited number of
predefined tones and a limited number of frequency integrations in one tone. To work around
these limitations and provide tone generation capability that is more flexible, the 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 that the prerecorded tones are used only for generation of tones. Detection of tones is
performed according to the CPT file.
7.2.1 PRT File Format
The PRT dat file contains a set of prerecorded tones to be played by the MP-1xx during
operation. Up to 40 tones (totaling approximately one minute) can be stored in a single file in
flash memory. The prerecorded tones (raw data PCM or L8 files) are prepared offline using
standard recording utilities (such as CoolEdit
TM
) and combined into a single file using the
TrunkPack Downloadable Conversion utility (refer to Section
F.1.3 on page 222).
The raw data files must be recorded with the following characteristics:
• Coders: G.711 A-law, G.711 µ-law or Linear PCM
• Rate: 8 kHz
• Resolution: 8-bit
• Channels: mono
The generated PRT file can then be loaded to the MP-1xx using the BootP/TFTP utility (refer to
Section
5.11.2.1 on page 138) or via the Embedded Web Server (Section 5.11.2 on page 137).
The prerecorded tones are played repeatedly. This enables you to record only part of the tone
and play it 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.
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