If your "Line1" SIP account fails (i.e. does not register or is not registered) then the ATA will drop you back to PSTN.
You can also setup a dialstring (or key) to force you onto the PSTN line - for example if I press # I will get my PSTN line - otherwise it goes to the net.
Or doesnt currently, as I can't register on eu.voxalot.com....
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