I have had "UltraFibre" Internet service from Spark for some time now. Initially, we continued to utilise our copper wire for a "Homeline" service, but Spark recently mothballed that and cut us over to a voice-over-fibre service.
We went with the "Integrated Wiring" option whereby the existing jackpoints in our house remain active, and the POTS1 outlet on the ONT was connected directly to our existing punch-down block by a Chorus Tech.
Recently, I've noticed that our Internet connectivity drops out when the telephone is in use. (It may have always been the case, but I've only just made the association) I'm using the Spark-supplied Huawei HG659 router, and 'net traffic jus stops whenever the phone is in use.
I was immediately disillusioned when (After waiting for over an hour) the Helpdesk person told me that it was almost certainly a problem with my filter and that I should replace it, followed by a "please hold..." when I explained to them that they were providing a fibre rather than DSL-based service to me.
Has anyone encountered this before? Any indication as to why a VOIP call might interfere with Internet access?