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Tie trunks are set up either to send signals to or receive signals from another PBX, or they are set up to be bidirectional, that is, to send and receive signals. If the system has bidirectional tie trunks, the signaling can be set for both directions independently. For example, outgoing (outmode) signaling can be rotary and incoming (inmode) can be Touch-Tone. Consult the local telephone company for more information.
The audible feedback for touch tones generated when a user presses a dialpad button can be heard by any user who shares a Personal Line or a Shared SA button with the telephone that is used to make a call. Therefore, when dialing confidential numbers such as passwords or account information, the user should take precautions, such as activating Privacy, to prevent others from hearing the touch tones.
Touch-Tone dial mode cannot be programmed for DID trunks that are immediate start.
Touch-Tone dial mode cannot be programmed for incoming, immediate tie trunks.
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 the System Requirements for TTRs Table.
Touch-Tone, single-line telephone users cannot make calls using individual lines/trunks programmed for rotary operation. The Touch-Tone signals generated from the telephone while dialing are transmitted to the Central Office at the same time the rotary signals are sent by the system. The Central Office receives both signals and cannot process the call.
