I have NEVER had problems with an activity switch, but another vendor who has a key system on a point-to-point off of one of our 2Ks claims the activity switch is causing them all sorts of problems. I do see 1 slip on the ckt during the hr of the switch, but that shouldn't cause problems. I'm not willing to use them for a clock source (6 other digital links on this PBX and no problems on any of them). Any ideas here? I'm not sure if they're just looking for someone to point their finger at....