Aristel AN171MC IP Speaker, Waterproof Wupport 3CX Multicasting , Dual Functionality as Both Loud Ringer & PA, Crystal Clear AudioAN 171mc IP Speaker AN 171mc series is an IP based paging speaker. They have different shapes, materials, and designs and can be easily installed indoors and outdoors. Aristel IP speakers are compatible with SIP & ONVIF protocols in VoIP and security fields. Up to 10 RTP multicast addresses enable the arrangement of different paging solutions. Alarms in an HTTP URL can combine with the alarm system: pre recorded messages and scheduled broadcasting to