How to block 911, 311, 411, 611 calls in Voxalot

[shibukraj]

Hi all,
I have a PAP2T ATA configured/registered to use my Voxalot account. The device is in INDIA and I want to block the 311, 911, 411 and 611 calls from this ATA since I dont want any one to accidently dial number like 911. I have removed this from the dial plan of PAP2T device. But when I tested the dial plan in Voxalot, what I can see is any 3 digit numbers like 911, 611 and 500 (voxalot voicemail) is configured by default to forward to XXX@voxalot.com. Since the device is in INDIA i dont want any one to dial 911 by accident. Is there any way to remove or block this default forwarding in Voxalot? Is there any work around using dial plan or some other mechanism to block calls like 911?

Any help is really really appreciated.

Thanks
Shibu Raj