I have a UC540 running 25 or so SPA508 phones and a handful of SPA525 in conjunction with a SF300 24p switch. The problem I am having is that all calls are routed through the auto attendant, and the VM system keeps cashing. Everytime this happens I simply have to go to site and reload cue and it starts to work again. However I would like to rectify this problem. I wave updated to the latest software but it still doesn't seem to help. I have also tried loading the config in to another UC540 I had and it does the same thing. These crashes seem completely random as well. Somtimes it will fail twice in one week and other times it will go for a couple months. There must be something in the config that is doing this, but i have no clue what it is. I have attached the config.
Configure Multicast Paging on the Cisco IP Phone 7800 Series or 8800 Series Multiplatform Phone
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Add Call Park on a Cisco 7800 or 8800 Series Multiplatform Phone Key Expansion Module
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