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Make sure that X_ProxyServerRedundancy is checked. If you use OBiTALK to configure your device, you will need to use OBi Expert Configuration to make the change.
X_ProxyServerRedundancy is enabled (check-marked) by default when configuring CC via OBiTALK; there should be no need to manually change it, unless the user intentionally disabled it previously.
However, if the service provider had been set up manually on the local web interface, it would need to be enabled.