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This is really an outstanding answer. &nbsp;Wish I could rate Excellent Plus! &nbsp;Thank you.
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This is really an outstanding answer.  Wish I could rate Excellent Plus!  Thank you.

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I have a site where every 10 days or so I start getting complaints that outbound dialing is failing. &nbsp;Typically the far end never starts ringing. &nbsp;And its inconsistent. &nbsp;Some folks are dialing ok but others not. &nbsp;CPU and memory are fine. &nbsp;I don't see the router under any kind of DOS attack. &nbsp;I would like to just syslog some kind of debug to troubleshoot this better at the next occurance. &nbsp;What level of debug would be recommended? &nbsp;It uses SIP to communicate with the PSTN provider. &nbsp;And internally it is a SIP trunk (CUCM sees it as a SIP voice trunk at a particular IP address. &nbsp;Not an MGCP gateway or other.) &nbsp;Currently I am running debug ccsip messages and the CPU is staying at a comfortable 5% with a very occasional brief peak to 25% or so.
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I have a site where every 10 days or so I start getting complaints that outbound dialing is failing.  Typically the far end never starts ringing.  And its inconsistent.  Some folks are dialing ok but others not.  CPU and memory are fine.  I don't see the router under any kind of DOS attack.  I would like to just syslog some kind of debug to troubleshoot this better at the next occurance.  What level of debug would be recommended?  It uses SIP to communicate with the PSTN provider.  And internally it is a SIP trunk (CUCM sees it as a SIP voice trunk at a particular IP address.  Not an MGCP gateway or other.)  Currently I am running debug ccsip messages and the CPU is staying at a comfortable 5% with a very occasional brief peak to 25% or so.

ISR Debug Recommendation Cisco Telephony

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.