I have an interesting problem, I know what it is but can not find the correct info to fix it. it's occur When made Call or forwarding through UC520 that time Outgoing calls are fine but Both Incoming call are droped out after few second menas when i pickuped call on VOIP Phone or any ext. but if we are Making Call or forwarding through a service provided by optus (an Australia Telco) Then All is going well.
which is why the gateway drops the call after few second. I belive I need to set signal immediate, but am unsure,Can you please point me in the right direction for solve this issue.