When calling a search firm, state your name and the reason for your call. For example, my name is Sarah Smith and I am looking to speak with a recruiter that works in Medical Affairs.
You would be surprised at how many calls we receive where the candidate does not introduce themselves and just starts talking. It's best to call from a phone with good reception and no noise in the background. Again, you would be surprised by how many candidates either have children or noise in the background with poor phone reception.
Candidates should have an updated copy of their CV that is easily accessible so that it can be forwarded to the recruiter either during or after the phone call.