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