voipinit,
Thanks for showing me where to make the change!
Two more questions. I assume where it asks for the default router, this would be the gateway or IP of my router, correct? And do I leave both DNS server 1and 2 as is, or do they need to be changed?
I have my ATA behind my router, Linksys WRT54GL. I have a patch cable running from a port on my router to the WAN input on the ATA. I gained access to the ATA by running a patch cable from a laptop to the LAN input on the ATA. Is this the correct way to go about making the changes?

Thanks again for the help!