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# Voice calls between Google Talk, MSN/Live Messenger and Yahoo! # Voice mail service, interoparable between major IM clients. # Voice conferencing: with any number of participants of any IM type. # Sending off-line messages and notifications. # Calling SIP phones and SIP services. # Receiving calls to your IM from any SIP phone. # Receiving calls to your IM from mobile or landline phones using SIPBroker. # Receiving calls to your IM from web users.