Network interface issues

This a known issue that often occurs on larger networks, where the NEC SV9100 / SL2100 system and handsets become unresponsive, this is cause by adding more and more devices on the network , in turn increasing the ARP requests on a later 2 network segment  ( normal process on a network ) , The NEC PBX product has issues processing every single one of these ARP Requests and causes a Denial of Service event on the NEC phone system where the ethernet interface / VoIP interface becomes unresponsive.

Symptoms:

SIP trunk registration issues 

IP handset registration issues

And a system re-start resolved the issue

Work around #1:

Move the phone system and handsets to a dedicated VLAN , reducing the devices on the layer2 network therefore reducing ARP traffic on the network.

For an existing deployed system this can be lot of work and often requires co-ordination with the IT consultants.

Work around #2:

Create an interface on your customers router that is on a different subnet and move ONLY the NEC SV9100 / SL2100 to this interface, as long as there in inter-subnet routing on the router IP handsets will find their way across the subnets ( only require a change of SIP server IP address on each IP phone ), IP Phones do not have the same issue with processing all the ARP requests, only the phone system CPU’s