I am using CME Version 7.0(1) and have a few 7960 phones configured. The phones keep resetting and it comes up as registration rejected. After a few seconds the phones re register without doing anything. I am using the loopback IP address as option 150 and for the CME IP address. The phones are using load 8.0(10.0) and all the files for it are in the flash. The phone type is configured under ephone. The max ephones and dn's is configure to the max. Below is a screen shot of what I am seeing:
I can tell you why your phones are unregistering - they are having TCP timeouts. The phones will send keepalives every 30 seconds, and if they miss 3 or 4 (don't remember offhand) they unregister.
The tricky part is finding out why there is a TCP timeout. Often it is a busy CPU, which isn't the case here.
Other TCP timeout possible causes:
What's the L3/L2 topology between the phones and CME? What's the platform?
You can use this command on CME to allow the phones to SPAN their PC ports so you can sniff:
service phone spanToPCPort 0
You could run a sniffer and see what's going on with the wire. You could also try switching IOS on the CME. Check interfaces on CME with 'show int' and on the switches for errors, output drops, etc. If you have QOS on the LAN, turn it off.
Very hard to tell what's going on with speculation.
I did as instructed and sniffed the packets. I was able to see the TFTP requesting for some files in packets 15606 to 15614. Am attaching the capture file for reference. However, I am struggling to find the cause. Please can someone assist.
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...