Ring Central Sees Q3 Adj. EPS $0.15-$0.17 vs $0.15 Est., Sales $165M-$168M vs $163.15M Est.; Raises FY18 Adj. EPS Outlook From $0.61-$0.65 to $0.66-$0.70 vs $0.62 Est., Sales Outlook Raised From $638M-$647M to $649M-$656M vs $643.31M Est.