We have the above Systems sitting on each side of a wireless controlled be a Microteck router.... At the moment we cannot get them to dial each others extensions... they can dial the internal extensions but not each other. The extensions are 200 range and a 300 range. We have tested to see if the ports are open by registering a phone across the wireless to the other system and it works hundreds. If I dial the other side ext it says "number temporarily unavailable", but on that phone shows as a missed call (does not ring), so it is reaching the phone, and assume it is not getting back to us.