Acme Packet last week announced it has acquired Covergence in exchange for about $22.2 million in stock and $600,000 in cash. Covergence provides software-based session border controllers (SBC) for unified communications, and is focused on the enterprise market while Acme Packet’s portfolio is more typically found in service provider networks. Acme Packet’s move follows the company’s April 2009 release of the Net-Net 3800, a hardware-based SBC also designed for small enterprise sites, contact centers and service providers.