Did you clone your machines from a single image, or do you use a VPN client on both machines? Softphones have a port name derived from the MAC address of the first network card. This is cached in a registry value.
1. If you clone a machine after it is cached, the cached value will be used, even though the new machine has a different MAC address. This means two softphones have the same port name and thus cannot be simultaneously active.
2. If you use certain VPN clients, the VPN software's MAC address may be chosen instead of your real network card. Some of these VPNs use the same MAC for all their clients.
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