Were troubleshooting a Lifesize unit connected to a Cisco 3750 router. When the Lifesize is configured for DHCP, it gets an IP address and the MAC address is known in the routers table. When the Lifesize is configured with a static IP address same mask and gateway as assigned when DHCP, the MAC address is not known in the routers table and PINGs from the network to the IP address fail. Lifesize moved to another location with another static IP address and it is fine.

Any ideas?