Is this a phone jack or ethernet port? : r/techsupport
telephone - Does anyone know if this is a Ethernet jack or a phone line? - Home Improvement Stack Exchange
Are house phone ethernet cables different from computer ethernet cables and if so do they both fit in the same wall ethernet hole or do I need a different one? - Quora
Types of telephone cables: All you need to know
Alida Systems Cable Telefónico ADSL con Conectores RJ11 de 5 m- Routeur A Través De Toma De Teléfono O Microfiltro/Blanco : Amazon.es: Electrónica