Just got this from them a few minutes ago - likely related:

TicketID : 93198
Opened : 7/22/2014 5:56:00 PM
Created by : IanH
Original Issue :
- VI had experienced a brief disruption wherein inbound and outbound traffic was being rejected at approximately 530pm Eastern. While this issue has since resolved itself our engineering team is aware of this and investigating this matter further. We will continue to advise as we receive updated information from our engineering team.
  
  Thank you

On 07/22/2014 03:57 PM, Plexicomm Admin via Outages wrote:

SIP not completing calls, anyone know why?

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