OfficeSIP Server is a VoIP program for PC. Just like skype, you can call from one PC to another free of cost. Don't like using computers for talking?
OfficeSIP Server allows using regular telephones for intra-office and inter-office calling without paying. Being a fully compliant, open-protocol SIP product OfficeSIP Server, it enables free VoIP communication between remote locations with no computers. Connect your wired or wireless office phones, handsets or headsets to inexpensive SIP devices and communicate absolutely free in a convenient and customary manner!
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