I've bought a 4G router - no name Model CPF903 - with ethernet to use in a remote office, saves the cost of a landline.
I've connected a Voip adapter - Linksys PAP2T - and an old style cabled handset.
Using a 3Three sim, I can make calls in & out.
But when using a 1pMobile sim, outgoing calls are fine, but incoming calls do not ring in. From the caller end, the call begins to ring out but then terminates after a few rings.
Any thoughts ?