I connect a new SPA504G phone to UC500 system. When I make a call from SPA504g it works good.The problem is when another incoming call is ringing to the phone. The display is freeze and nothing is working. You have to unplug and plug the phone to start again.
If you place the first call on hold and make a new outgoing call is working good. Find below the config. settings on UC500:
Do I have to make any changes to phone from Web administration? I login on phone Web administration but I can see only the settings but it does not allow me to make any changes.