0000009f. Not a DTMF Digit.

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Hello !

My asterisk log is full of messages like this:

[2011-03-06 19:01:15] DEBUG[20556] res_rtp_asterisk.c: Ignoring RTP
2833 Event: 0000009f. Not a DTMF Digit.
[2011-03-06 19:01:20] DEBUG[20556] res_rtp_asterisk.c: Ignoring RTP
2833 Event: 0000009f. Not a DTMF Digit.
[2011-03-06 19:01:25] DEBUG[20556] res_rtp_asterisk.c: Ignoring RTP
2833 Event: 0000009f. Not a DTMF Digit.
[2011-03-06 19:01:30] DEBUG[20556] res_rtp_asterisk.c: Ignoring RTP
2833 Event: 0000009f. Not a DTMF Digit.
[2011-03-06 19:01:35] DEBUG[20556] res_rtp_asterisk.c: Ignoring RTP
2833 Event: 0000009f. Not a DTMF Digit.

This happens for different clients..

Any ideas what would that mean and how to fight it?

Thanks,
Nick