I'm trying to disable the softkeys that appear during Active Call State i.e. Hold, End Call, Transfer, Conference.
While I was able to disable 'End Call' through the parameter softkey.feature.endcall="0", I'm having a hard time to find out how to disable the other SoftKeys that get added during Active Call State.
I think this is working as designed.
The UCS 4.0.1 Admin Guide states on Page 502:
Control the display of the Hold, Transfer, and Conference soft keys. If set to 0 and the phone has hard keys mapped for Hold, Transfer, and Conference functions (all must be mapped), none of the soft keys are displayed. If set to 1, all of these soft keys are displayed.
As the VVX500 (not tested by myself) does not have any physical Buttons this may be currently the expected behavior.
Any changes to the current software should be raised via your Polycom Reseller in order to bring this to the attention of a Polycom Systems Engineer.
Polycom Global Services
setting '..redundant' to 0 disables the softkeys while the call is connecting but once the call has connected, a new set of softkeys appear.