求教：与potential supervisor电话的交流

本人申请12fall phd，递交了申请后被一个教授email套瓷，回复了教授的邮件后，他写信说“I would like to talk to you over the phone to discuss a bit in more details about my research”。

请问教授的来信算不算是要电面？到时该怎么发挥呢？ 求版友赐教！