scope:

This standard addresses Tones and Announcements associated with Ineffective call attempts.

Tones addressed include:

• Busy Tone;
• Reorder Tone; and
• Special Information Tones.

Announcements addressed include: 

• Reorder;
• No Circuit;
• Vacant Code;
• Intercept; and
• Ineffective Other.

The tones and announcements delineated above are used in the Public Switched Telephone Network (PSTN).

This standard also addresses the mapping of Cause Indicator Values specified for the ISDN User Part (ISUP) and Digital Subscriber Signaling System Number 1 (DSS1) in ATIS-1000113 and ATIS-1000607 and ATIS-1000607.a, respectively, and the tones and announcements identified in this standard. This mapping is for use in call processing involving two or more interconnecting networks (ICNs) when Signaling System Number 7 (SS7) is used for call control. This standard considers the provision of these tones and announcements by originating, intermediate, and terminating ICNs.

All other tones and announcements and the mapping of other Cause Values not included in this standard are candidates for further study for inclusion in this document in the future.

Purpose

This document provides guidelines intended to standardize the application of tones and announcements to differentiate ineffective call conditions.

This standard also provides guidelines to be used as a basis for the provisioning of tones and announcements in an SS7 environment by ICNs.

Application

This document is intended to be used by Telecommunication Service Providers and vendors to standardize the use of tones and announcements for the treatment of ineffective call attempts within the PSTN for SS7 and non-SS7 environments.