- We don't believe Cisco will move to acquire Sonus Networks at this time. Why? Cisco has an enterprise SBC (CUBE) which has been gaining acceptance in the enterprise segment. According to Infonetics, in 1H'12 Cisco's enterprise SBC market share jumped to 26 percent, up 3 points Y/Y. On the carrier side, the ASR 5000 has had SBC capabilities since Cisco acquired Starent back in Oct. 2009.