FTDM_CHANNEL_BUFFER 2967 src/ftdm_io.c  					ftdm_clear_flag(ftdmchan, FTDM_CHANNEL_BUFFER);
FTDM_CHANNEL_BUFFER 2969 src/ftdm_io.c  					ftdm_set_flag(ftdmchan, FTDM_CHANNEL_BUFFER);