Phone / Router folks. Is this plausible?

667 Views | 0 Replies | Last: 2 yr ago by DAM
Gilligan
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AG
Here's the scenario:

We're a Cisco shop calling into a International Bank's Skype for Business Conference system.

Both us and the bank are AT&T customers. We've done extensive testing, call trace and packet captures.

8841 >> CUCM >> Local managed router / GW >> AT&T GW >> AT&T Network << AT&T GW << AT&T managed local router / GW << Bank PBX << Phone

Several companies are on a conference call into the bank. Different companies, different cites etc. If we call from a desk phone or a conf phone and don't make a noise for 40 seconds our line gets dropped. Only us. We can call back in from a cell phone and stay connected. We can make a noise every few seconds and stay on for over 20 minutes.

AT&T's finding is that the bank's PBX is sending a proper disconnect after 40s of silence. It's only to us.

Is this plausible? I am calling BS on AT&T's findings as it makes no sense at all.
DAM
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AG
Does this only happens with this particular call path? Something along the way is configured to drop the connection when it doesn't see traffic, although it should be seeing keep alive traffic. Your best bet is to take a packet capture at your exit point and see who sends the first goodbye.

dam
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