Video Door phone is based on experience and knowledge of Fanvil VoIP video door phone development. Stream transmission uses standard IP / RTP protocol and video transmission adopts RTSP. It is compatible with lots of major platforms, such as 3CX, Asterisk, Broadsoft, Elastix, etc. SIP video door phones provide seamless security solutions. IP Video door phone have high quality relaible door security and ememrgency buttons solutions.