Ionic RealTime Chat

Hi guys, I just want to ask or give me some suggestions. I need to create a real time chat using ionic framework and mysql as backend. As I research for this, I bump to firebase and other third party which I do not want to use. PhoneRTC says you don’t need to have third party, so I concluded to use this plugin. Can I use phonertc for my ionic app… is it possible to create without third party? Thanks in advance