Chosen Solution

After a (now blocked) scam call where an unreachable Telstra voice msg was left, handsets had ongoing red flickering message light (this problem fixed, thank you so much, by cluey IFIXIT contributor) but fast stuttering when the handpieces are picked up remains.
Any help would be much appreciated. Thank you.

Hi @jan2 , A “stuttering” dialtone is an indication that there is a message in your Voicemail (Messagebank) service. What happens when you dial 101? Are there any messages still there?