Prerecorded Tones File - AudioCodes Mediant 4000 SBC User Manual

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37.4

Prerecorded Tones File

The Prerecorded Tone (PRT) file contains user-defined prerecorded tones that can be
played by the device. For example, it can be used to play a held tone (music on hold) to a
call party that has been put on hold or a ringback tone to a calling party. The PRT file
overcomes the limitations of the CPT file (such as limited number of predefined tones and
limited number of frequency integrations in a single tone).
The PRT file also lets you play different held and ringback tones for different groups of
users. To do this, configure an IP Profile with the required ringback tone
(IPProfile_LocalRingbackTone) and/or held tone (IPProfile_LocalHeldTone) from the PRT
file, and then associate the IP Profile with the required IP Group.
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 PRT file can be up to 4 megabytes in size.
•
If the PRT file contains a tone that also exists in the CPT file, the tone in the PRT
file is played instead (i.e., overrides the tone in 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.
You can include up to 80 user-defined tones (a maximum of 10 minutes) in a PRT file. The
tones can be recorded using a standard third-party, recording utility (such as Adobe
Audition), and then combined into a single and loadable PRT file (.dat) using the latest
version of AudioCodes DConvert utility (refer to the DConvert Utility User's Guide). Once
created, you need to install the PRT file on the device (flash memory), using the Web
interface (see 'Loading Auxiliary Files' on page 627) or CLI.
You must record the tones (raw data files) with the following properties.

Coders: G.711 A-law or G.711 µ-law (and other coders)

Rate: 8 kHz

Resolution: 8-bit

Channels: mono
The PRT file can include prerecorded audio tones of different coders (e.g., some with
G.711 and some with G.729). 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 632
Mediant 4000 SBC
Document #: LTRT-40203