Comcast Business hit with nationwide outage affecting voice calling

Comcast Business Services (NASDAQ: CMCSA) customers nationwide lost access to their phone service due to a nationwide outage affecting the MSO Tuesday.

A message posted in a Comcast support forum at 8:53 p.m. EST Tuesday read: "We've isolated the issue and are working diligently to restore your services. We will continue to provide updates as more information is available."

Based on customer comments, the service outage affected both inbound and outbound calling. According to Down Detector, the outages were heavily concentrated along both the East and West Coasts. The site said the most affected cities include Chicago, Houston, Seattle and Atlanta areas.

By Tuesday evening, Comcast released a statement saying the issue was resolved.

We're sorry for the inconvenience today's phone outage has caused to our small business customers. The issue has been fixed and we're working to ensure their services are fully restored as quickly as possible. We know our customers rely on us and we're committed to making it right. We'll continue to keep this link updated with the latest information:

The outage affected voice services for small- to medium-size businesses, Comcast said. The company's Business VoiceEdge or PRI Trunking lines have not been impacted. 

For more:
- visit this Comcast Business Services support forum

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UPDATED: This story was updated on July 13 to include new comments from Comcast.