I tried to change from the DHCP address to static, but it was not saved. I think the problem is related to the box having two NIC cards, eth0 and eth1. The first time I installed FreePBX, I used a static IP address for eth1. Perhaps I entered something incorrectly in this screen.
When I installed the second time accepting DHCP, I got to the System Admin, Network Settings, changed the drop-down to eth1 and entered the pertinent data. However, the configuration was not changed after pushing the Save Config button.
So I went to the console and ran system-config-network. It was still set to DHCP! I changed the data and ran ‘service network restart’ and all was well.