As I have 2 Voip providers (one in the UK and on in the Netherlands) I have created 2 clusters
Reason for this is that I can use cluster 1 named NL to make calls with the Dutch Voip provider, and cluster 2 named UK to make calls with the UK voip provider.
Extension one (5000) is set to use cluster NL and extension two (5007) is set to use cluster UK.
All is working great

.. Even when a person calls.. When calling the UK nr, phone 5007 rings, and when a person calls the Dutch nr. The 5000 rings.
The only problem (for now) is when I try to call from extension 5000 to 5007 and or from 5007 to 5000. It just does not work.. I get an engaged tone.
When I set one of the extension to the SAME cluster, calling from extension 5000 to 5007 and or from 5007 to 5000 works great.
Only problem now is that I can only make calls from the voip provider that is set to the used cluster.
Anyone here who might have a working solution for this?