Cisco SPA504G and Linksys SPA942 Daylight Savings Rule String
If you use IP phones from Cisco/Linksys and especially the SPA504G or the SPA942, and need to set a Daylight Savings Time Rule, try the following, provide you have setup a primary NTP server.
LinkSys SPA942 Daylight Savings Time Rule:
start=3/8/7;end=11/1/7;save=1
CISCO SPA504G Daylight Savings Time Rule:
start=3/8/7/02:0:0;end=11/1/7/02:0:0;save=1