I have a cisco 1811 ISR and i want to configure the dial backup on the analog port of router V.92. I don't want to conect an externam analog moden on AUX port. I don't know how to configure this process.

There is agroup of network conected to a Cisco 1811 ISR through site to site VPN. Everything goes fine but after 5 or 6 hours of traffic , the users can not reach any more the servers and even when the routers are restarded , the problem remain the s...