IP public address and intercom server based on open SIP standards. iSpeaker series SIP broadcasting gateway includes two models: C20 and B20. They are innovative products developed by Zycoo Europe R&D team. iSpeaker SIP gateway convey IP Voice Package to analog signal to amplifier, speakers for remote broadcasting. It compatible with Third-Party SIP broadcasting system and SIP Servers. The iSpeaker comes with GPIO interfaces, capable to integrate with keypad, microphone for duplex-intercom, also can integrate with various kinds of sensors to work as alarm system.