I have a client who has deployed VVX 501's and other models, with the 188.8.131.5248 firmware build. They are a Skype for Business Online environment (no hybrid) with Exchange Online, using Azure Voicemail.
IF/when voicemail notifications on the the phone work, and they don't always, it seems to be 6-10 minutes before the icon's on the display reflect a VM or update the count on the number of VM's. Without an Exchange Online UM Dialplan, is this going to be the expected norm for SFBO/AzureVM with VVX phones, just a cyclic check for VM changes? If so, I would like to suggest a timer adjustment where the phone polls on a 60 second or 120 second interval.
I do also see "Server Missed Call Status" is Disabled in the SFBO/AzureVM scenario, is this also expected?
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This is to be expected as documented => here <= and working as designed as the time frame is 10 minutes when we perform an additional check against exchange.
This can be found using the search => here <=
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