Cannot receive calls

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This is related to the IP Handset (IP Centrex), or the Gateway Device (IBL, PRI) ability to register to VoiceMailTel network. There are a few possible causes:

1. Power Outages
2. Loss of Internet Connectivity
3. Router / Firewall security settings blocking VOIP traffic.

Note: Calls should still route to Auto Attendent and/or VM. Customers can also choose emergency routing options, i.e. route to cell phones or landlines.