I don't know of any that just do telephone shops or even specialize in them. Many companies will have some here and there. She's going to have to register with a lot, just like we do for on-site jobs. The only ones I can think of seeing recently are Beyond Hello, I-Myst and Marketing Endeavors. I'm sure some other members can add to the list.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.