See FS-3379

ftmod_sangoma_isdn.c:ftdm_sangoma_isdn_io_run()
	remove unused variable wflags.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

ftdm_io.c:ftdm_channel_process_media()
	status variable was set but otherwise unused
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

add sip_liberal_dtmf chanvar and liberal-dtmf profile param to use the maximum methods of DTMF avoiding sticking to the spec which leads to incompatability

FS-3367 --resolve the start was actually broken in the same way, instead of your exact patch I replaced both original functions to work as your patch suggests