@AndrewOA liitle time has passed but the voice echo problem persists, and I'm wondering if there are any suggestions to move this forwards. Is the problem likely to reside in the router, the EE...

@AndrewO It's a Gigaset C610A I am using a SIM, described as "5G EE Unlimited Calls, Texts & Data SIM". I haven't arranged or bought any telephony beyond that. It works fine apart from the echo which...

I have a new NX510V supplied by the TP-Link Store on Amazon , ie. NOT anything custom ISP. I have an EE 5G SIM inserted and my ex-landline base-station connected to the RJ44 port. It works for voice...