... Quick Details Place of Origin: Guangdong,Website:http://www.voipphonetech.com, China (Mainland) ... SIP2.0 (RFC3261), TCP/UDP/IP, RTP/RTCP/, HTTP, ICMP ARP/RARP, DNS, DHCP, NTP, ... equipment, Web browser, or TFTP and HTTP Center Server; 12.Support upgrading encrypts configuration files by ... TFTP or HTTP; 13. Microminiaturize and legerity ...