I've just discovered that Callcentric does not need to be SIP Registered for incoming calls.
At CC, you can set up call treatments and redirect all calls to:
voxalotid @ [au|us|eu].voxalot.com
From experience, I have found that using no cluster code is less reliable and sometimes incoming calls go straight to voicemail; this issue doesn't seem to crop up if using the cluster code.
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