EXHIBIT 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statement of Aspect Communications Corporation on Form S-8 of our report dated January 22, 2000 (February 18, 2000 as to Note 16), incorporated by reference in the Annual Report on Form 10-K of Aspect Communications Corporation for the year ended December 31, 1999. /s/ DELOITTE & TOUCHE LLP San Jose, California March 29, 2000