AudioCodes Mediant 500 MSBR, User Manual

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User's Manual 778 Document #: LTRT-10375
Mediant 500 MSBR
48.4 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 for SBC calls 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.
•
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).
•
Play of tones from the PRT file is applicable to Gateway and SBC calls.
•
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. Once created, you need to install the PRT file on
the device (flash memory), using the Web interface (see Loading Auxiliary Files on page
771) 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 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.
48.5 CAS Files
The CAS Auxiliary files contain the CAS Protocol definitions that are used for CAS-
terminated trunks. You can use the supplied files or construct your own files. Up to eight