... (IMS compatible), according to RFC2543 and RFC3261, seamless compatible with all popular call agent, including HUAWEI, ZTE, Alcatel-Lucent, etc. Rich ... , call forward, call waiting, hot-line call, alarm clock, and all kinds of value-added voice service.Support auto-adaptive jitter ... *115mm*32mm(length*width*height)Net weight0.5Kg IAD3002 VoIP products