In reply to harold walmsley:
Do you have cable with the likes of V Media or one of the other modern cable suppliers? Otherwise, not sure why you have a landline phone plugged into router (except maybe if it’s internet phone?).
In all my ISP contracts and different routers over the years I’ve never plugged a phone directly into a router (except with VM, but that is different). I did have problems with the phone functioning with VM as well as various others problems so got rid of after some 3 mths since they couldn’t or wouldn’t resolve.
Broadband and phone by the usual Open Reach setup with me is a splitter in the usual telephone socket (well actually it’s an extension which is not recommended, but is as good performance as the master for me; I don’t use the master socket at all); from splitter one lead to the router and the other to the phone. The splitter has the necessary micro filters within. If I wished I could plug another phone into the master but would have to add a micro filter in between.
Thoughts assuming it’s a normal Open Reach/BT setup (pure layman’s thoughts as just from my experience over the years):
1. IIRC some old adsl micro filters are no good with more modern setups; I had to change some really old ones when I used to use to use more phone sockets.
2. If you have to plug the phone direct into the router for whatever reason, then why add a micro filter at the back? I would have thought that any filter was before the router and the router itself would have any protection it needed as standard?
3. Modified face plate? If it’s a modern faceplate then it may have a micro filter built within. Also, I’m not sure micro filter in line with another micro filter is needed and may be detrimental? Maybe you are using too many filters? I only have one and that is within the splitter (besides any standard provision in BT’s master socket).
Edit: Even with VM where I did plug a phone into the router*, I never needed a micro filter. The problems I had were not due to that. In reality I think it was the same setup maybe as you. I took the phone cable from the router to the master socket which I had removed the input wires, so it then went to the extension socket where the phone was actually plugged in. No micro filter was needed though.
Post edited at 15:18