8028 to 8028s delay

[jan]

I have an issue when calling between 8028 and 8028s internally.
When they call each other there is a speech delay i can see the call is established but cannot hear the other site for about 3 seconds.
Have anybody ever had this problem.
System in on latest R2.2 OXO connect.

[vad]

You have just two phones? Or - no problem with 8028-8028 and 8028s-8028s?

[jan]

I have multiple phones. I have 8028, 8028s.8029 and 8039.
I only have the issues between 8028 and 8028s.
No issue 8028 calling digitals.
No issue 8028s calling digitals
No issue 8028-8028.
No issue 8028s-8028s.