Frequently the reason is your provider has automatically put you on to voice mail which conflicts with your on-phone answering machine. Contact your provider and tell them to cancel voice mail. This corrects red flasher in very many cases
Hi. Already solved in over 1600 cases. If you have switched to Telstra recently the problem most likely will be the they automatically connect you to voice mail at Telstra. So ‘messages' are collected there and your on phone answer system does not get to record. Simply call Telstra and cancel voicemail and red light syndrome is fixed.