This is someone else's thread but I'll answer you
Brian.
the normal maximum speed for DTMF is about 40mS per digit or 25 digits per seconds so you should be OK. The actual speed you can send from a mobile phone depends on the phone manufacturer and I doubt they release the figure in the specification as it isn't something a normal user would worry about. If you can't send AT commands to produce tones fast enough, try loading the digits into one of the phones memories (phonebook) then tell it to dial the number from there.
Brian.
How fast an individual phone model works is decided by the phone manufacturer, there isn't a standard as far as I know.
Do a search for a document called "t68i_at_commands_dev_guidelines.pdf" which lists all the AT commands supported by the phone. On page 151 it tells you how to suppress response messages and on page 145 it tells you how to use ATDxxxxxx to dial number xxxxxx and also how to dial from the memory and last callers lists.
Brian.
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