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 <https://www.facebook.com/wabashcommunicationscoop/> <https://www.instagram.com/wabashcommunications/> <https://www.youtube.com/channel/UCWoo3wyybeYEnTpTxK2jbUg> <https://www.linkedin.com/company/18788687/admin/> <http://www.wabash.net/>