Especially after VoLTE, all 4G data are IP based and even voice data are actuall controllable in Application Processor, it's basically SIP+RTP on a port like 50

Especially after VoLTE, all 4G data are IP based and even voice data are actuall controllable in Application Processor, it's basically SIP+RTP on a port like 5060. Someone need to develop a VoLTE p2p.