Nortel Networks TP-1610 SIP Prerecorded Tones PRT File, Voice Prompts File, PRT File Format

Mediant 2000 SIP User’s Manual 7. Configuration Files

7.2Prerecorded 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.

7.2.1PRT File Format

The PRT dat file contains a set of prerecorded tones to be played by the Mediant 2000 during operation. Up to 40 tones (totaling approximately 10 minutes) can be stored in a single file in flash memory. The prerecorded tones (raw data PCM or L8 files) are prepared offline using standard recording utilities (such as CoolEditTM) and combined into a single file using the TrunkPack

Downloadable Conversion utility (refer to Section G.1.4 on page 218).

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 Mediant 2000 using the BootP/TFTP utility (refer to Section 6.13 on page133) or via the Embedded Web Server (Section 5.11.2 on page 82).

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.

7.3Voice Prompts File

Note: The Voice Prompts file is applicable only to the VXML application.

The voice announcement file contains a set of Voice Prompts to be played by the Mediant 2000 during operation. The voice announcements are prepared offline using standard recording utilities and combined into a single file using the TrunkPack Downloadable Conversion Utility.

The generated announcement file can then be loaded to the Mediant 2000 using the BootP/TFTP utility (refer to Section 6.12.1 on page 132) or via the Embedded Web Server (Section 5.11.2 on page 82).

If the size of the combined Voice Prompts file is less than 1 MB, it can permanently be stored in flash memory. Larger files, up to 10 MB, are stored in RAM, and should be loaded again (using BootP/TFTP utility) after the Mediant 2000 is reset.

The Voice Prompts integrated file is a collection of raw voice recordings and / or wav files. These recordings can be prepared using standard utilities, such as CoolEdit, GoldwaveTM and others. The raw voice recordings must be sampled at 8000 kHz / mono / 8 bit. The wav files must be recorded with G.711∝-Law/A-Law/Linear.

Version 4.4 137 July 2005