VOIP compatibility on Windows Phone 8.1

Question

We had a situation where we wanted to build Windows Phone app with minimum compatible version Windows Phone 8.1. It makes uses of VOIP calls over 3G / 4G and Wifi.

I am unable to find whether Windows Phone 8.1 has full support for VOIP calls or not. Can anyone redirect me to right documentation or guidance if WP8.1 supports VOIP?

Answer 1

Check these. I think it does.

ChatterBox-VoIP-WP81
Upgrade calls from cellular to VoIP in a Windows Phone Silverlight 8.1 app
understanding-and-using-voip-support-in-windows-phone-8

Answer 2

Please check this below link for VoIP capabilities of Windows Phone 8 https://msdn.microsoft.com/en-us/library/windows/apps/jj206983(v=vs.105).aspx

I'm trying to develop a VoIP application based on these solutions: https://github.com/DoubangoTelecom/boghe & https://github.com/BelledonneCommunications/linphone-wp