consulting experience on the resume

unknown

Hey everyone,

My older brother contacted me a while back about setting up pbx's with him at clients sites. He works for a guy who has his own consulting business and he tends to pay cash. My question is if I perform a few deployments that paid cash would I be able to list that in my resume? Also, how would I list it as?

Consulted for XCompany
Voice Engineer

Projects XXXPlace From 1/1/12 - 1/3/12
Implemented etc.....


XXXPlace From 2/10/12 - 2/15/12
Designed a voice solution etc...


Let me also add I still will be at my current job fulltime so do i leave that on top of the consulting work on the resume or still keep it below it.