[Freeswitch-users] Called id name is not displayed - Cisco 7912G devices

I run a freeswitch pbx with about 10 cisco 7912G (with SIP firmware) and 2 linksys devices. When I call a local device from a cisco ip phone, we don't see the called device id name, during ringing and talking. The only thing displayed is the dialed number. Linksys devices display called user name as expected. Is it a problem with the specific device and firmware or there is something I could do to fix it? Is there anyone else using cisco 7912G phones that can help with the situation? Regards, Panos