I try to get a KX-DA15 PBX working with 8 KX-TCA155 PSs. I have two KX-TCA0141 CSs and I put the PSs in two PS Ring Groups to use the 2 CSs and have four calls simultanously. But the problem is that the PSs ring again a second or two *after* one of the PSs has answered the call and this is an annoying "feature". Can this be fixed? Thanks for your help.