Calls going straight to Follow Me-PRESENCE_STATE unknown

Having a strange issue that has recently started without any changes to the configuration-I think.
All calls to the ext. go right to Follow Me whether or not the primary ext. is in use.
Its also only for a couple ext.
Note: All was working fine and did not start happening until yesterday??

When I call the ext from inside or out. I see:
[2014-06-06 10:32:32] WARNING[29804][C-00000008]: func_presencestate.c:132 presence_read: PRESENCE_STATE unknown

System info:
Asterisk (Ver. 11.9.0)
PBX Firmware: 5.211.65-12
PBX Service Pack:

Any guidance would be greatly appreciated.


Any ideas on this would be much appreciated.

how much time and what is the ring strategy?

Thanks for pointing me in the right direction.
I thought I double checked all the settings on this ext. but it was set to ringallv2-prim not ringall-prim as the others.
Changed and resolved.
Thanks again.