Do you have experience selling? Don't be shy about it! Give examples of your hardest/biggest sales. 

Do you speak clearly? Do you have effortless charisma when it comes to engaging others over the phone? Talk yourself UP! 

Telemarketing isn't for the faint of heart. Make sure your employer can tell how tough you are when it comes to making calls upon calls every day. 

A major part of working remotely is the ability to self manage. Do you follow-up? Do you put in what you expect to get out? Explain how this can be done in the position you are applying for.

Do you have goals? How does this job help you meet them? What kind of sales numbers do you want to be hitting for yourself?