SIP Communicator : Main - SIP Communicator SIP Communicator - the Java VoIP and Instant Messaging client. SIP Communicator is an audio/video Internet phone and instant messenger that supports some of the most popular instant messaging and telephony protocols such as SIP, Jabber, AIM/ICQ, MSN, Yahoo! Messenger, Bonjour, IRC, RSS and counting. By zkipin Internex > Messengerswith system:unfiled