Panasonic NS1000 - Page 190

NB: IP-CS do not support P2P communication, so no P2P Group setting is available for IP-CS.
The P2P Group for the desired
extension can be set here.
‘Settings’ -> PBX Configuration -> Slot
-> Virtual Cards -> Port Properties
4-2. P2P Group Setting
The P2P Group for IP-Extensions can be set in the appropriate Port-Properties screen;