Using European Telephones

In many European countries, it is common for telephones to have four additional keys, labeled A, B, C, and D. Additional DTMF tones are defined for these keys, extending the set of DTMF tones from 12 to 16 in Europe.

If your application will be accessed only from countries where these additional keys are available, you can take advantage of them by setting your application's WTEApplication.DetectABCD property to TRUE. Setting this property to TRUE causes the WTE to treat the A, B, C, and D keys as additional DTMF tones.

You should set DetectABCD to FALSE if your application will be accessed from countries where the additional keys may not be available. When DetectABCD is FALSE, the WTE ignores the DTMF tones generated by the additional keys.

The DetectABCD property also influences mnemonic menus. For example, you might want to let the caller use the letters on the phone to select menu items:

For Australia press A. 
For Denmark press D. 

In this case, if DetectABCD is TRUE, the A and D keys generate the additional DTMF tones. If it is FALSE, the caller would need to use the 2 and 3 keys, on which the letters A and D are printed.