eero phone connection

[RoyD8]

My Wi-Fi connection dropped yesterday. I have got it connected today but when I try to link eero to my old modem and in turn my home phone, eero goes red. Previously, I linked the ONT cable to my old modem and another cable from modem to to the eero. A phone cable was used to link to cordless phone. This worked perfectly and I had no issues with IPad, PC and TV apps. However, to get Wi-Fi connection today I have to link ONT and eero directly and not through the modem. Hence, I do not have an home phone. All other linked devices are working perfectly. All advice greatly appreciated. Thanks

[Michelle-TalkTalk]

Hi Roy,

Apologies for the confusion. The set up should be eero connected to the ONT and the DVA (digital voice adapter) connected to the eero. Can I ask why you have an additional modem connected please?

Thanks

Michelle