There is no test number but it is easy to test since I used it everyday with my 3102, on the Linksys they do not have to be registered to work, I have the 3102 line registered with sipphone.com and only invoke this VSP via dial plan and gateway function of the 3102.
This provider is mainly for dialling PSTN and it also has an incoming PSTN number, it is not a big community like FWD where we can dial each other
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