I have a problem with a small IP telephony system (sip) and i'm using a cisco 881 router as router/firewall.
The problem is that sometimes you can not call in. It happens only occasionally and when it does our ip phone provider says that there is no response from our ip phone/switch back to them on the internet.
We have an ip-phone/switch-device on our local network. We we receive calls they are first routed to our ip phone provider which then sends it to us.
It can work 20 times and then it is a call that can not get to us.
How should I start debugging? Is there any logging for SIP traffic so I can send logs to a syslog server?
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...