In light of recent issues there is some ongoing work on various systems over the next few days, sorry to be a bit vague. We obviously aim to minimise any disruption caused. We'll post more details where possible here.
Some VoIP phones are being funny over some IP changes, so may need restarting.
There are likely to be more VoIP server config changes later tonight as well. Devices should cope, but we know some do not and need restarting. Please do try this first before contacting support.
Some router upgrades tonight, should not cause any issues.