Asterisk and yum updates to your server
If you are running an unsupported version of smeserver-asterisk (contributed by Selintra Limited to contribs.org) then you should upgrade your system to ATrpms Asterisk 1.4 (see the quicknotes sections). If you are runnning SARK Bristuff then you can freely yum update your system.
As you may or may not know, the Digium analogue-card driver "zaptel" is very sensitive to the kernel release. Up to now this has meant a re-compile of zaptel and a new rpm every time there is a kernel change (which seems to happen fairly frequently in the CentOS/SME7 world). However this is not usually necessary with SARK...
Yum Updates
Stop asterisk with...
/etc/init.d/sark stop
Now apply your yum updates...
yum update
SARK bristuff asterisk
Reboot your system
ATrpms asterisk
After your yum update, do the following..
Reboot your system then do...
/etc/init.d/sark stop
yum install zaptel-kmdl-`uname -r`
This will unstall the corrcet zaptel drivers if your kernel version has changed.
Reboot your system again.