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Unread 06-10-2009, 06:20 PM   #10
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I think it is asterisk 1.4 and earlier that has DTMF RFC2833 issues. You can google this to check it

Also you make no mention of the asterisk configuration, whether on a public IP or behind a NAT, as I have seen firewalls , NATs, routers that seem to hinder DTMF (I can not explain WHY)
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