help the journalist

Hey all,

I am a journalist! I have a digital dictaphone that I use to record interviews with people I meet with face to face. I also have a caseette recorder. I used to have to have a connection that went into this recorder and then plugged into phone connection...I have since misplaced the lead and now only have the cassette recorder...I need to conduct interviews over phone again and everywhere I go no one knows what I'm talking about. I got the recorder from an office supplies shop that has since closed..other office supplies places don't even have a basic dictaphone...is there any connection I can get to plug into my digital one or anyone bloody help me..ahhhh!