Ohioans wanting to be on the national Do-Not-Call Registry can call a toll-free sign up line starting today. The registry will place their phone numbers off-limits to most telemarketing calls. So far, most of the nearly 17 million phone numbers registered before the July fourth holiday have been put on the list via the internet. The Federal Trade Commission administers the registry. The phone number is 1-888-382-1222 and the web site is www.donotcall.com.