Prerecorded Tones File - AudioCodes Mediant 4000 SBC User Manual

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

37.1.4 Prerecorded Tones File

The Prerecorded Tone (PRT) is a .dat file containing a set of prerecorded tones that can be
played by the device. For example, it can be used to play music on hold (MoH) to a call
party that has been put on hold. Up to 40 tones (totaling approximately 10 minutes) can be
stored in a single PRT file on the device's flash memory.
The PRT file overcomes the limitations of the CPT file such as limited number of
predefined tones and limited number of frequency integrations in one tone. If a specific
prerecorded tone exists in the PRT file, it overrides the same tone that exists in the CPT
file, and is played instead.
You can define a PRT file with multiple tones of the same tone type but with different
coders. If one of the tones is defined with the same coder as used in the current call, the
device always selects it in order to eliminate the need for using DSP resources. If the coder
of the tone is the same as that of the call, DSPs are not required. If they are different,
DSPs are required.
Note:
•
The PRT file only generates (plays) tones; detection of tones is according to the
CPT file.
•
The device does not require DSPs for playing tones from a PRT file if the coder
defined for the tone is the same as that used by the current call. If the coders are
different, the device uses DSPs.
•
The device requires DSPs for local generation of tones.
•
For SBC calls, the PRT file supports only the ringback tone and hold tone.
The prerecorded tones can be created using standard third-party, recording utilities such
as Adobe Audition, and then combined into a single file (PRT file) using AudioCodes
DConvert utility. For more information, refer to DConvert Utility User's Guide.
The raw data files must be recorded with the following characteristics:

Coders: G.711 A-law or G.711 µ-law (and other coders)

Rate: 8 kHz

Resolution: 8-bit

Channels: mono
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
device repeatedly plays this cadence for the configured duration. Similarly, a continuous
tone can be played by repeating only part of it.
User's Manual 574
Mediant 4000 SBC
Document #: LTRT-41729