[asterisk-r2] Sending DTMF 'f' ?

[Amilcar Silvestre]

Hi,

I have a box using asterisk 1.4.23.2, and OpenR2 1.1.0. The board is a  
Sangoma A104D, From times to times, it shows this message:

WARNING[31548] rtp.c: Don't know how to represent 'f'

Seems to be something related to sending a DTMF digit. After this  
message, the caller (an internal SIP endpoint) doens't hear anything  
more from the called (far end, coming from a R2 link), but the far end  
keeps receiving the audio from the SIP end point.

The message comes with no intervention from the user on SIP end point.

Does anyone knows what is happening?

Thanks,
Amilcar.