Internet Down - One-way Audio

[DND ON]

Stumped on this one. Our Internet service went down, part of the big Comcast outage in the northeast. Didn’t failover to the redundant carrier, but that’s another issue.

While Internet service was down, we experienced one-way audio on outside calls. Odd, because our voice is delivered via AT&T SIP trunks with an MBG. We have Teleworker phones connected via a second MBG which resides in a DMZ.
 
We’re running two HX controllers with PS-1 servers, MiCollab AWC and CSM. It makes sense that the Teleworker phones went down, and no one would be able to web into the AWC. Otherwise, nothing in the phone system touches the Internet. But when Comcast came back, one-way audio went away.

Any thoughts?

[ralph]

Which side couldn't hear?  The inside user or the outside user?

My first reaction would be that your ATT trunks come in through your Comcast internet.  - just a SWAG on my part.

Ralph

[DND ON]

The outside party couldn't hear.

The AT&T SIP trunks are delivered via a dedicated fiber circuit with it's own router. It's used for voice only; the data portion of the IP Flex is not used.

[Tech Electronics]

DND ON,

It seems as though your setup in either not quite right or you are having some SIP transformation issues and it is seeing the return path coming back through the Comcast connection. The best thing to do now, while it is working, is to get wireshark going on both ends of an outside call and see what the packets are telling you when the call gets setup and is in progress; I am sure you will find it enlightening.

Thanks,

TE

[DND ON]

Thanks TE, I can't think of anything else.

Enlightening. That's never good!