User`s manual

SIP User's Manual 392 Document #: LTRT-83303

Mediant 1000 & Mediant 600

6.3 Prerecorded Tones (PRT) File

The Call Progress Tones (CPT) 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 Prerecorded Tones (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: The Prerecorded tones are used only for generation of tones. Detection of

tones is performed according to the CPT file.

The PRT dat file contains a set of prerecorded tones to be played by the device during

operation. Up to 40 tones (totaling approximately 10 minutes) can be stored in a single file

in flash memory. The prerecorded tones are prepared offline using standard recording

utilities (such as CoolEdit

) and combined into a single file using the TrunkPack

Downloadable Conversion utility (refer to the Product Reference Manual).

The raw data files must be recorded with the following characteristics:

 Coders: G.711 A-law or G.711 µ-law

 Rate: 8 kHz

 Resolution: 8-bit

 Channels: mono

The generated PRT file can then be loaded to the device using the BootP/TFTP utility or

via the Web interface (refer to ''Loading Auxiliary Files'' on page 266).

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.

6.4 CAS Protocol Auxiliary Files

The CAS Protocol auxiliary files contain the CAS Protocol definitions that are used for

CAS-terminated trunks. You can either use the supplied files or construct your own files.

Up to eight files can be loaded and different files can be assigned to different trunks. The

CAS files can be loaded to the device using the Web interface or ini file (refer to ''Loading

Auxiliary Files'' on page 266).

Note: All CAS files loaded together must belong to the same Trunk Type (either E1

or T1).