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 2^nd 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
Office: 618.665.3311
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