After setting up Zaplee, I received this email from skype after making some test calls:
Subscription cannot be used with multi-user devices
Here's a quick reminder that Skype's subscriptions are for individual use only and do not include calling from or through multi-user devices such as PBXs - as stated in our Fair Use Policy. Any members of your Skype Manager who call landline or mobile phones from such devices will be charged at our standard call rates.
However, they can still benefit from their subscription when calling directly from Skype or a stand-alone Skype-enabled device. Please sign into to your Skype Manager to manage your members' subscriptions.
The people at Skype
Is this a problem?
Hi Scott, this is correct, as I mentioned you will need Skype Credits to make calls to extensions that are mapped to regular phone numbers.