How do you generally dial/enter the international number after calling your calling card number? Some cards ask for "<Country Code> phone number", some ask for "011<Country Code>phone number".

So depending on your calling card system's requirement, you need to choose the number format as the "Format required for DTMF tone".

The setting "Delay before sending DTMF" can be left as 1 for most cases. Increasing this number is required only if the calling card system makes you wait for a long time before entering the phone number.