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Touch-Tone or Rotary Signaling Feature

Description

Follow these steps to calculate the number of TTRs required by the system:

1. Total the TTRs needed for the volume of calls per hour (see System Requirements for TTRs Table).

You must consider the call traffic across a private network when estimating the number of required TTRs. This includes calls on analog tandem tie trunks and T1-emulated tandem tie trunks. In addition, if your private network includes Centralized Voice Messaging, you must consider the call traffic coming across the private network for the voice messaging system and the TTRs required for the updating of Message Waiting lights. For this updating, a TTR is required at the sending end and the receiving end. If the systems in the private network are connected by PRI trunks, no additional TTRs are needed.

2. Calculate the number of TTRs required by the voice messaging system(s) (see TTRs Required by Voice Messaging Systems/Auto Attendants Table).
3. Calculate the number of TTRs needed for delay announcement devices, both primary and secondary (see TTRs Required for Primary Delay Announcement Devices When Using Prompt-Based Overflow Table and TTRs Required for Secondary Delay Announcement Devices When Using Prompt-Based Overflow Table). If no announcement is used on a primary or secondary delay announcement device, no TTRs are needed.
4. Calculate the total TTRs available on the system by adding the TTRs on the modules that supply them (see Table 5 below)
5. Compare the total number of TTRs required by the system to the total number of TTRs provided by the modules in the system. If the number required is greater than the number provided, one or more modules must be added to the system.

Topics
	Description
	Touch-Tone Receiver (TTR) System Requirements for TTRs Table TTRs Required by Voice Messaging Systems/Auto Attendants Table TTRs Required for Primary Delay Announcement Devices When Using Prompt-Based Overflow Table TTRs Required for Secondary Delay Announcement Devices When Using Prompt-Based Overflow Table Steps to Calculate Required TTRs TTR Settings
	At a Glance
	Considerations & Constraints
	System Programming
	Mode Differences