[VoiceOps] SS7 problems

[Dave Frigen]

Awesome, many thanks for the info.

 

From: VoiceOps <voiceops-bounces at voiceops.org> On Behalf Of Nate Burke
Sent: Friday, December 11, 2020 12:10 PM
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] SS7 problems

 

I don't work with SS7, so this may just be a coincidence, but 2 days ago I
was having VoIP Troubles that appeared to be with traffic Traversing a Telia
circuit between my endpoint and my provider.  Did not affect all traffic,
not even entire /24's.  It was like Telia was dropping some UDP traffic for
some IPs.  Same symptoms that you describe though, the the call attempted to
be setup, but the ACK never made it back, call was canceled and retried.
The ACK might get back on the 2nd or 3rd attempt.  Removing Telia from the
route path on Wednesday fixed the issue for us, and I haven't had any more
reports since.  

Nate

On 12/11/2020 11:55 AM, Dave Frigen wrote:

I know SS7 is not a big part of the voice world for many of you, but for
those of you still exposed to it, just curious if anyone experienced any
problems with SS7 signaling in the past couple of days where Terminating
signaling times out and a 2nd retry and new call set up for the call
delivery occurs. The result was the phone ringing the customer, no one
there. Second attempt successfully (if multiline hunt group) comes in on
next line/trunk.

 

Trouble tickets reported:  Customers complaining about phones ringing, no
one on the other end.

 

We traced the issue upstream in the SS7 signaling. The signaling was timing
out after 15 seconds, creating call retry. We had our SS7 provider look into
it. No trouble found, but the "gremlins" mysteriously disappeared after the
testing..concerned trouble may reoccur.

 

Any reference to anyone else experiencing these issues recently would be
appreciated.

 

Dave

 

Dave Frigen

Chief Operating Officer 

Wabash Communications CO-OP | www.wabash.net <http://www.wabash.net> 

Office: 618.665.3311 

                                                                 

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