Is there a way for someone to unblock incoming blocked numbers with VOIP?

My boyfriend has VOIP and we believe his wife (they are going thru a divorce) has somehow found a way to unblock all incoming blocked numbers. Even if I use *67 my name/number show up on the caller ID, as well as all other anonymous or blocked calls they receive. Is this possible?

Related posts:

1. Is there a VOIP system I can use for incoming calls that has a sophisocated programmable IVR?
2. Do anybody know a voip soft-phone able to manage different voip numbers at the same time?
3. How will you dial VOIP numbers from your normal phone while using an ATA?
4. Is there any VoIP service that has free incoming and outgoing SMS messages?
5. Are the Internet connections and VOIP on cruise ships reliable ?