Prerecorded Tones (Prt) File; Prt File Format - 3Com VCX V7122 User Manual

For example: To configure the dial tone to 440 Hz only, define the following text:
Figure 57 Defining a Dial Tone Example
#Dial tone
[CALL PROGRESS TONE #1]
Tone Type=1
Low Freq [Hz]=440
High Freq [Hz]=0
Low Freq Level [-dBm]=10 (-10 dBm)
High Freq Level [-dBm]=32 (use 32 only if a single tone is required)
First Signal On Time [10msec]=300; the dial tone is detected after 3 sec
First Signal Off Time [10msec]=0
Second Signal On Time [10msec]=0
Second Signal Off Time [10msec]=0

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.

PRT File Format

The PRT dat file contains a set of prerecorded tones to be played by the VCX V7122 during
operation. Up to 40 tones can be stored in a single file. The prerecorded tones (raw data
PCM or L8 files) are prepared offline using standard recording utilities (such as CoolEdit
and combined into a single file using the TrunkPack Downloadable Conversion utility (see
Creating a Loadable Prerecorded Tones File
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 VCX V7122 using the BootP/TFTP utility
(see Configuration Files Parameters
Auxiliary Files on page 86).
The maximum size of the combined PRT file that can be stored in RAM is 1 MB. The PRT
file is permanently stored in flash memory only if there is available space. Otherwise, it
should be loaded (using the BootP/TFTP utility) each time the VCX V7122 is reset.
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.
3Com VCX V7122 SIP VoIP Gateway User Manual
on page 224).
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