Yes it should work. We made recently some calls between Beijing and Montreal successfully (and quality was very good).
| De: "Federico Badino" <fbad...@gmail.com> | À: ring@gnu.org | Envoyé: Lundi 10 Septembre 2018 18:24:01 | Objet: [Ring] [Ring Android - 20180826] | Hi. | I want to know if it work in China. | Thanks