Here are 7 questions you should be asking:
1) How long has your company been an inside sales recruiting agency?
2) Does your company specialize in inside sales or do your company recruit for other roles?
3) How can you demonstrate your expertise in this arena ?
4) Has your agency written any white papers on inside sales recruitment? If so how many and where are they published?
5) Describe your inside sales recruitment process?
6) Were you ever an inside sales director ?
7) How many inside sales recruiters does your company have?
These questions and the respective answers will help you decide if the inside sales staffing agency is the right choice for you.