Cogent just has an issue this morning, our internet was down for about 20 minutes.
The wierd thing is, we can not call any numbers outside the company. Our PRI is on a seperate voice gateway connecting to Verizon which should not be affected by the internet.
Unless Cogent and Verizon share the same physical layer and there was an issue with that physical layer, I can not think of any other causes. I called both parties and they denied they share any lower layer facilities.
You may also want to make sure that the dial peers used for these types of calls are also not going out over the WAN via VOIP. It is possible your calls are using the WAN without your knowledge, but fail over the PRI. Not as likely, but something to check.
It is reasonable to see a WAN failure affect both internet and phone systems.
I worked with someone this week where their internet T1 was receiving slips and they were getting static on the FXO lines at the same time!
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...