... device has the features of high integration, easy to build network, seamless interoperability with call agent, strong SIP expansion, high ... can be widely used in telecom operators, SOHO, small family network, etc.FeaturesCall protocol: SIP (IMS compatible), according to RFC2543 ... call agent, including HUAWEI, ZTE, Alcatel-Lucent, etc. Rich network protocol: including TCP/IP, UDP, RTP/RTCP, ARP, FTP/ ...