vpn, who's fault is it?

[cubby1223]

I'll be back looking at this on Monday at the office.

There are 4 locations each with a VPN router. They are all configured to communicate with each other. 3 of the 4 locations the phone system works fine between them.

On the 4th location, I have the vpn configurations in the router the same as the others, and I can communicate through the vpn, I can ping all the devices on the other end, I can access printers, file shares, web interfaces of devices, etc. But this one phone system does not connect through to the others.

The firewall features of the vpn router and cable model are all turned off, and are identical amongst the 4 locations.

Anything I want to do between the locations I can do. But the phone systems will not communicate from the one office. What are the chances the fault is in my vpn setup, versus the fault of the phone system setup? I will be bringing another vpn router to the 4th office on Monday and switch it out, but we've been going back and forth blaming each other (the phone vendor) while nothing is getting resolved.

(The ISP is the same at all 4 locations, Comcast)

Thanks

 

[jlazzaro]

make/model of routers and phone system? are you testing connectivity from the subnet of the phone system in the 4th site? are you sure there are no inspection rules on the router/firewall?

ask the phone vendor for logs...i don't know what "will not communicate" means. is the h.323/sip peer timing out, trunk negotiation failure, etc?

if any of your routers/switches support SPAN/mirroring, take a packet capture of the network traffic with wireshark and verify the communication.