Registration limit = 0, means you use the free service which doesn't let you register providers (by clicking "register: yes" in your provider settings).
Your PAP2T should have no problem registering to Voxalot using one of the voxalot servers and your voxalot username and password if you configured everything correctly. Have a look again at the Voxalot home page for instructions on how to configure your Linksys. Also you can check out my somewhat old but still largely valid Voxalot Setup guide/walkthrough that gets into more details.
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