Under T.C.A. § 17-2-208, general sessions and juvenile judges may interchange with each other. The substituting judge need not be a resident of the same county, but must otherwise possess the same qualifications of the absent judge. If another judge cannot serve by interchange, general sessions and juvenile judges who must be absent from court may seek a special judge pursuant to the requirements and process set forth in TCA 16-15-209.  General sessions court judges may sit by interchange for municipal court judges, but not vice versa.  T.C.A. § 16-18-312.