Yes I use ast_waitfor with 2nd parameter -1 into a detached background thread. The function ast_waitfor used into my application function called from the dialplan and also into the dtmf read thread. This behavior is observed after bridging the incoming channel(the channel where I try to read dtmf) to an other channel created with dial API.
I modified channel.c (line 3924) to disable the logging this error (just for an experience ). I can get the DTMF from the incoming.
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