About Tristan Cober

Tristan Cober · 02-22-2018

So I was troubleshooting some failed backups for a customer - figured out eventually that the backup server filled up - and I was attempting to download the DRF logs on RTMT but the Query got stuck. Checking the command line there was over 380,000 fi...

Tristan Cober · 07-07-2016

Just putting this out there so people who run across this behavior aren't stuck looking. Below is pattern matching for a REFER from a Unity SIP Trunk doing a Call Transfer. This is the Same DN with CFwdAll to the same destination however in the first...

Tristan Cober · 05-11-2016

Having a hard time finding documentation to back up what I am seeing in one customers environment regarding inbound fax. Simple Topology: Fax - ???? - Telco - PRI - Gateway - SIP - CUCM - SCCP - VG310 - Fax Both the Gateway and the VG310 were (incor...

Tristan Cober · 09-08-2015

So we have a situation where we have a 3rd party IP PBX integrated with CUCM via a SIP trunk. The IP PBX has it own Voice Mail system it uses, so calls from phones registered to call manager to phones on the IP PBX will reach the Voice Mail that is i...

Tristan Cober · 06-09-2021

So I don't think that SAN part is correct. Working with a client using a wildcard cert signed by a Public CA, but the wildcard is only in the SAN and not the CN (afaik not the correct way to do this, will be changed). Cert:CN=domain.comSAN:DNS:*.doma...

Tristan Cober · 02-23-2018

Yep tried everything except restarting the server. Checked the LPM logs and it seems to be in line with that bug, just a different trace file this time. Strangely the only logs present are those when the backup issue started happening and not before....

Tristan Cober · 11-20-2017

Bumping as I am having problems with registering a SIP trunk with this exact scenario, Outside in VRF Inside in global. Even with correct bindings and using multi-tenant the SIP Registers refuse to use anything but the global routing table. Running 1...

Tristan Cober · 05-12-2017

Can you provider scrubbed invites with replacement numbers/names/IPs for us to look at? The Request header should be where destination routing is done. The providers inbound Invite will likely be UDP. The SIP ALG for UDP and the NAT UDP timers would...

Tristan Cober · 02-11-2017

The Invite and 488s you are seeing involving "VaxSIPUserAgent/3.0" appears to be an attack on your router. You should configure tollfraud prevention, permitting only the IP addresses of your routers and phone subnets in your permit list. Your One-wa...

Member Since	‎09-08-2015 05:52 PM
Date Last Visited	‎06-13-2021 06:13 PM
Posts	57
Total Helpful Votes Received	49

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Unable to delete DRF logs?

Active DN not tied to device handles CFwdAll for REFER incorrectly, compared to INVITE

Fax Fallback Pass-Through, is it actually required for Fallback?

Intermittent SIP/2.0 488 Not Acceptable Media in response to re-invites when Early Offer is used.

Re: Android 11 Supplicant and ISE EAP System Certificate

Re: Unable to delete DRF logs?

Re: SIP-trunk in VRF

Can you provider scrubbed

The Invite and 488s you are