GN9330 connecting to CISCO IP-Phone 9951

https://www.jabra.com/_/.../Jabra...9400.../Jabra_Pro9400_DECT_Security_Datasheet....

You can use a standard PC or cell phone headsets with Cisco phones. With help of our adapters, you can convert computer headset, smartphone headset or cordless phone hands-free into Cisco compatible headset.
Cisco IP Phones

I think you're confused. IP Communicator is the unified communications client (IM and Phone) It is looking for a capatible headset so you can use your softphone. This software is not your VPN client. There are two different cisco product: one for your VPN and one for your phone. If you're trying to ocnnect to an old-style Cisco VPN, your IT dept will have to configure that with a certificate.
Solution from Cisco: http://www.cisco.com/en/US/products/sw/voicesw/ps5475/products_tech_note09186a00809b6c40.shtml
This behavior is observed when a user attempts to install or use the IP Communicator on a system that has different names for the Playback (wave out) and Recording (wave in) devices.
In order to overcome this problem, perform one of these tasks:
-Use a USB headset that is recognized by the IP Communicator.
-Upgrade to the latest version of the IP Communicator

Connecting a hub or switch to the "PC" port on the back of the phone is not a recommended best practice by Cisco as the IP phone does not support spanning tree protocol.

Confirm if the Phone has power supply. and If it's connected to a POE switch confirm that it connects to the Switch port on the phone.

Is the phone connected to a POW (Power Over Ethernet)Cisco Switch? Check the model number of the switch with the Cisco web site www.cisco.com

Have you check whether there is power available on the switch?
enter "show power inline" at the command prompt.

Does the phone work without the head set?
Does the same thing happen when you plug in the head set on another phone?

can somebody help me we have a Sip connection between a mitel 3300 and Cisco callmanager only the conference call doesn't work who can help me out

You can solve this by connecting your phone inline.
On the back of the phone where the phone handset plugs into, plug one end of the jabra headset wire & connect other end to the 2nd position (marked by phone & handset). Now plug the handset wire from Ip phone to the 1st position (marked by handset) in the jabra headset. Now you are good to go.

When the phone rings lift the phone handset and answer it with your jabra headset. You can't use jabra with 7941 without lifting the handset on phone.

I would verify what the firrmware is of the phone. It is possible that the phones need to be upgraded.