... and speaker Support Jitter Buffer, VAD, CNG, SIP, Domain name register, point-to-point Call Support RTP and RTCP Support ... STUN, CITRON, AVS Mode Support SIP domain, SIP Authentication (none, basic, MD5), Domain Name parse Support two SIP server synchronously, including ... provide DNS service for LAN Network equipment Support DNS domain name resolution in WAN port Support router and switch function ...