How Many Phone Numbers Can A Single Contact Have?

Hello,

How many phone numbers can be assigned to a single contact?

Somehow my phone number has gotten onto a shared telemarketers data base and I have been getting at least a call a day. (Yup, I have even been on the Do Not Call Registry for a few years.) It seems as though you can only block 30 individual contacts, so I created a "Do Not Answer" contact and dumped all of the restricted numbers into it. So far I have 35 numbers. I am just wondering how far that I can carry this strategy for my sanity.

Peace,

Dr. Z.