I've noticed a pattern while I have been looking for a new job, I am terrible at telephone interviews. The feedback I get is almost always negative: that I don't sound passionate or that I come across as underwhelmed. Out of 5 telephone interviews I have only been invited back for a face to face once and even that time they still gave negative feedback.
This is in contrast to my face to face interview technique which I regard as very good. I nearly always get invited back for a final interview and get an offer at least two thirds of the time. Even when I don't get an offer the feedback is positive.
I have a deep voice and I am worried that this may cause me to come across as bored or uninterested. How can I improve at telephone interviews?
UPDATE
I did some practice telephone interviews with some friends that I trust to give me honest feedback; they work in HR so I respect their opinions. They said I come across as bored, as if I am only half listening and like I would rather be doing anything else than be on the phone. They also said that I gave very closed answers to questions.
Obviously this is very bad, I do not intend to give this impression to people and always focus 100% on the interview and always thoroughly prepare for it. I think without body language and facial expressions I don't pick up on the requirement for more expansive answers that are required in certain situations.
I have decided to take some voice coaching and err on the side of longer answers and more talking rather than less.