We have some offices in the Dominican Republic, using the tunnel and connecting to my corporate pbx. Occasionally, the network on the remote end goes down for a blip of a second and a call is dropped... So, they start their call over. However, the first call is only dropped from their phone. 3cx hangs on to it, until the provider sends their re-invite, at the 1 hour mark to ensure the other end of the call is still there. Anyone else experience this?