I've subscribed to the VOIP OVH service but i don't know how to configure it for Android. I heard about Zoiper.
Does someone know to set up the VOIP line?
Thanks for the Help 
Hello @RanuglioZ,
I am proposing this thread on the French forum. If this method works, feel free to write your own thread in English, I will then mark it as a solution and it can be proposed to the English community. 
Good navigation on our forum.
https://community.ovh.com/t/zoiper-sur-android-serveur-ovh-a-ajouter/26234