Vodavi StarPlus 2706 Corded phone "sts sync" Questions

SYNC On my Vodavi STARPLUS STS Part #: 3515-71 I am getting the following message on the screen: "LKD-24B V0.3 SCOUT-DX V1.1 OK-SYNC". Only the numbers button make a sound when pressed, but they don't

sts My vodavi phone system is not working for 3 days. The display shows: LKD-24D V0.6H SCOUT-DX V1.1 OK SYNC I called a repair man had he is trying to come to look at it but there is no dial tone. The