Two phone interviews. One with the recruiter and another with a sales manager. Moving on to the final round which is an in person interview at one of the offices. What really helped me is researching the interviewers before hand and have a good understanding of why I want a job in sales. Going to an open house and connecting with a current BDC is also really helpful. Also for the second interview be ready to do a brief sales pitch if they see you have a background in sales and always show concrete examples highlighting your skills when answering questions. Be conversational and always close out each interview asking for the next steps.