EXHIBIT 23 Consent of Independent Accountants We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-41458) of ADTRAN, Inc. of our report dated June 21, 2000 relating to the financial statements of ADTRAN, Inc. 401(k) Employee Savings Plan, which appears in this Form 11-K. /s/ PricewaterhouseCoopers Birmingham, Alabama October 13, 2000