Everytime I get a phone call on my optus landline, the first call drops after a few seconds. If the person calls back it usually works but it's super unreliable on the first call.
Anyone else reported this / know of a solution?
It sounds like it's struggling to establish the connection on the first attempt.
Are you using the Sagem router/modem as that? or have it sitting behind another device (that isn't an NBN device)