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Unread 09-21-2009, 07:13 PM   #11
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This was a bug affecting outbound SIP calls in Asterisk 1.4 and 1.6. This issue has been fixed in their latest builds.

An upgrade should resolve your issues. Otherwise, you can specify dtmfmode=inband on your outbound trunks and force G.711u. However, this didn't work very well in my experience.
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