Hello,
i have elecfreaks gsm shield http://www.elecfreaks.com/wiki/index.php?title=EFCom_GPRS/GSM_Shield and I use this library Google Code Archive - Long-term storage for Google Code Project Hosting. .
SendDTMF work fine, but DetDTMF haven't response.
Both functions are on the bottom this file Google Code Archive - Long-term storage for Google Code Project Hosting.
Other things work fine.
Thanks for your reply.