Help-line queue-busting software provider Netcall said it continued to trade comfortably in line with management expectations throughout the first half of the year as it maintained double digit sales growth.For the six-month period ended December 31st 2012 order inflows remained strong while double-digit sales growth was preserved. Netcall, whose products include its flagship automated call back product QueueBuster and whose clients include Avon, British Telecom, and McAfee, said both new customer wins and sales to existing customers have contributed to growth, the group said. Netcall added that the acquisition of Serengeti is boosting group earnings and the integration of its business and ECM product suite is progressing to plan. The group maintained its debt free balance sheet and at December 31st 2012 the net cash balance had increased to £8.2m from £7.7m at October 31st 2012 after a share buyback of £0.25m in December.CEO Henrik Bang commented: "The group performed well in the first half of the year, delivering strong operating cash flows and sales growth, whilst at the same time integrating Serengeti.""Along with new customer wins such as North Wales Housing, we are pleased with the level of cross-sales achieved in the period such as the sale of an Eden solution to The Warranty Group, an existing workforce management customer. The addition of Serengeti provides further opportunity for cross- and up-sales and the Board remains confident in achieving a successful outcome for the year."CJ