After upgrade to v12 we have 2 issues dealing with how our phone deal with calls. We are using Cisco SPA525G2 Phones with 3 Buttons dedicated to BLFs. Issue A - The BLF buttons do not light consistently or sometimes at all across phones. I have (2) phones with separate extensions but LIKE BLF buttons on my desk. When a call comes in for one of my BLF extensions ONE of my phones will show the activity, the other phone will not for as much as 10 seconds later. Sometime the BLF will flash on one phone, while solid on the other. Issue B - SOME Incoming calls to an extension ring only once and then go to voicemail. On the calling side the person calling will hear 4 rings and then the call will go to voicemail. The Extension being called will only hear 1 ring and then right to voicemail.