[VoiceOps] SS7 problems

[Dave Frigen]

We've narrowed this down to calls completing on our facilities (from likely
least cost routing) down an AT&T TDM/SS7 terminating trunk group. We have no
contacts for this trunk group, and even turned the trunk group down for a
day thinking we would get a call, but didn't. We're still getting two calls
to a single number, one call with caller on it and the other with dead air.
The dual calls are coming from various service providers on this trunk
group. 

 

Anyone have any suggestions?

 

Dave

 

From: Dave Frigen <dfrigen at wabash.net> 
Sent: Friday, December 11, 2020 11:55 AM
To: 'voiceops at voiceops.org' <voiceops at voiceops.org>
Cc: 'Rodney Young' <Rodney at wabash.net>; 'Don Ross' <deross at wabash.net>;
'Barry Adair' <barryadair at wabash.net>
Subject: SS7 problems

 

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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 <http://www.wabash.net/> 

 

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