Can the firewall pass packets
When a firewall is used, make sure to
configure the firewall appropriately to allow
VoIP packets to pass through the network
without being blocked by filtering.
Are layer 2 or higher switches used?
Do not use repeater hubs as they can increase
the network load.
Also note that the port of the switching hub that
connects to the IPCMPR/IPCEMPR/
IP-EXT16 cards should be set to operate
under "Auto Negotiation" mode.
Are Category 5 (CAT 5) or higher cables
QoS (Quality of Service)
Can the router or switch be configured to
use priority control features?
2.2 VoIP Requirements Checklist
Model of firewall:
Model of switch:
Model of the router/switch:
V-IPGW16 card's ToS field
IP Networking Guide