How can i keep my IP phones alive longer,they intermittently keep dropping & looking for the server? The ISP provider has not resolve the latency issues, I've documented with their IT? Just looking for a temp fix until I can get the ISP to resolve.

Try setting 15-05-47 and 48 to 60.

Thanks Coral, that appears to have fixed my issue.

Cool. Just so you realize that it's your router causing this issue and the settings on it. Your router/firewall is collapsing the NAT tunnel WAY to fast. If you have a lot of deployed phones this could be an issue with unneeded traffic.