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Touch-Tone or Rotary Signaling Feature

Description

A Touch-Tone receiver (TTR) is required either to make calls from tip/ring equipment or to use the Remote Access feature. TTRs are provided on 412 LS-ID-TDL, 800 DID, 008 OPT, 800 GS/LS-ID, 016 (T/R), 016 ETR, and 024 TDL modules. Normally, these TTRs are sufficient to handle the calls originated from these modules. Additional TTRs, however, may be needed to support the following services:

• Tie trunks and T1-emulated tie trunks set for DTMF signaling.
• Tandem tie trunks and T1-emulated tandem tie trunks used in a private network.
• Remote Access.
• Account Code Entry.
• Authorization Codes.
• IS III AUDIX Voice Power.
• IS III Integrated Voice Power Automated Attendant.
• IS III Fax Attendant.
• MERLIN Messaging System.

  For MERLIN Messaging Systems of Release 2.5 or later, TTRs are not allocated for calls made from the MERLIN Messaging System module ports but are allocated for calls made to the MERLIN Messaging System module ports. To ensure correct operation, use the TTR requirements shown in See System Requirements for TTRs.

• Octel 100 Messaging.
• MERLIN MAGIX Enhanced Customer Care Solution.
• Avaya Attendant.
• Intuity CONVERSANT.
• Intuity AUDIX.
• Message-Waiting light updating for Centralized Voice Messaging when the updating codes are sent over tandem tie or T1-emulated tandem tie trunks (Hybrid/PBX mode only).
  
  

  When Messaging-Waiting light updates are sent over PRI tandem trunks, no TTRs are needed.

• Group Calling: Prompt-Based Overflow setting

If more TTRs are needed to support the services listed above, other modules with TTRs can be added. System Requirements for TTRs Table shows the estimated number of TTRs needed for the operation of the communications system, depending on the system's call volume and the use of account codes. Additional TTRs may be required to support voice messaging systems and delay announcement devices used by Calling Groups (see TTRs Required by Voice Messaging Systems/Auto Attendants Table, 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).

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.

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