Grandstream Networks HT812 v2, CNG, G.711, G.722, G.723, G.726-32, G.729ab, OPUS, VAD, T.38, musta, FCC/CE/RCM, K.21, TCP/IP/UDP, RTP/RTCP (RFC1889, 1890), HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SSH,..., SIPS, SRTP, TLS