I have a CTI problem with my Personal Communicator/Presence Server installation.
I use CUPC to control my IP Phone (7942) but sometimes the CTI feature suddenly doesn't work anymore and the icon in the upper right corner (where you can switch between no phone, softphone, ip phone) greys out. If I restart the CUPC client the icon reverts to softphone mode and the ip phone icon is still greyed out. This happens for all users simultaneously. Everything apart from CTI works perfectly.
The funny thing is that CUPC goes back to normal mode after some time (after 5 minutes or so) and CTI with ip phone works again.
There is a transparent L2 firewall (Cisco Firewall Service Module) between the presence server and the client running personal communicator. The firewall is configured as follows:
- permit ip any any in both directions
- sip inspection disabled
My next action would be to remove the firewall between server and client, but this is not so easy (since it is a live system with other traffice going through the firewall).
So I was wondering if anybody out there is/was experiencing the same issues.
Could this whole thing be related to some firewall session timers? Any other ideas?
FWSM Firewall 4.0(4)
Any help greatly appreciated. Thanks.