I had a wacky issue over the weeken

[phonetechallen32]

I had a wacky issue over the weekend with a NEC 9100 on a emergency call. When I went onsite onsite digital and the remote IP phones were not working. Had a black screen... But as soon as I unplugged the network cable from the VOIP card. All the phones came up. I went back out today with a VOIP card but everything was working. Im thinking it was a Network issue but has anyone experienced this.
Also they have SIP trunks
Thanks

 

[conxtel]

Run a Wireshark and check for an ARP request to 0.0.0.0. For whatever reason the CPU will try to respond to those requests and will eventually get overwhelmed and lock up.

I had the same issue. Customer's 9100 was going down every week. They had a couple of no longer used devices on their network that were sending the requests. We removed them, and things settled down for a month or so, then started up again. We had the phone system on the customer's corporate network and right at the same time, they had fibre installed and switched ISPs. We pulled the phone system off their corporate network and installed it behind it's own router and it hasn't happened since.

 

[belevedere]

It's possible someone was attempting to hack in. Bombarding the system. You might want to look into beefing up your firewall.

 

[DoubleDizzle]

Hello phonetechallen32,

I agree with belevedere and conxtel.

Sounds like a SIP Vicious attack or something similar.

Make sure the firewall rules are buttoned down on any SIP related ports.

A Wireshark capture may reveal nefarious traffic on the network.