Realpresence group 500 can make calls but not recieve
I've been trying to move my realpresence group 500 unit from a dedicated/unfirewalled conncetion to a faster, but firewalled link and have found a problem.
When going through the firewall I can connect to another of my group 500 units (on a dedicated, non firewalled link) as an outgoing call no problem. Both systems connect fine and the connection is stable and good quality.
However when I then try and call the firewalled unit back the unit knows there's a call coming in and shows the calling unit's name but it cannot answer the call and establish audio and video links.