Vistance Networks (VISN) is trading 7.45% down at $5.96 in pre-market amid a third-quarter revenue miss and lower full-year outlook. - The company's November 5 Q3 update reported $319.7 million in sales, falling short of the $350.5 million estimate. - Diluted EPS of $0.24 surpassed the $0.15 estimate. - Shifting customer demand was cited as the reason for the lower outlook.