Blocking IP-Relay Calls?

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Someone with way too much on their hands has been calling our home phone tonight over and over again. I believe the person is using IP-Relay: http://www.ip-relay.com/

We use Vonage (VOIP) for our phone service, so is there a way to block this IP-Relay service through the router? We have contacted customer support, but I doubt they will do anything. Any help is much appreciated.

Thanks.

 

[JeffTL]

Be aware that blocking a relay service altogether could preclude calls from deaf people who may have legitimate business with you in the future. Further, there are several other relays out there that could be used if you managed to block one -- so as with any form of nuisance telephone calls, the best situation if you cannot identify the assailant is probably to change your number.