I think you have to go with your gut on this one. We've worked with clients to coordinate the use of telemarketing services through UpWork and have had a good experience. But we stuck with native-English speaking freelancers. Most on them were from the US. When they call, ask them to not only ex...
I used to sell event sponsorships via phone, so I think you can sell everything if you want, but you need to make pre-sale emails, find great contacts e t. c. Try to sell expensive tickets on business events, for example. The % you can get from organisers also depends on your negotiation skills, ...