DTMF Dialler 1.30

This application functions as a DTMF dialer, designed for use with fixed-line telephones.

Users can access their iPhone's contact list to select a contact, then initiate playback of DTMF tones corresponding to the selected number. The process involves transmitting tones that a standard push-button telephone recognizes to establish a call.

The supported signals include digits 0-9, the letters A-D, as well as #, *, and pause commands (represented by commas).

Recent updates include the ability to delete playback history and a fix for an issue where the app would hang upon pressing a button.

However, users should be aware of the following limitations:

• Designed solely for use with push-button telephones.
• Functionality may be inconsistent on certain push-button devices.
• Not compatible with the built-in speaker of the iPod touch; an external speaker is required for audio output on this device.

The application features four distinct modes, accessible by sliding the interface to switch between them:

1. PLAY TONE MODE: Utilizes the iPhone's contact list or recent calls to playback DTMF tones. Allows attaching prefixes to phone numbers prior to dialing.
2. BIG BUTTON MODE: Provides a large, easily pressable play button, facilitating manual tone playback while the iPhone's speaker is positioned near a telephone handset.
3. MOBILE PHONE MODE: Designed for making calls over mobile phone lines. Mode switching can be quickly achieved by sliding the interface.
4. ENGINEER MODE: Extends functionality to include playing tones A-D in addition to 0-9, *, #, and pause commands. This mode also enables adjustment of tone duration and pause duration for advanced users.