1 COMMON STOCK [QUINTUS LOGO] COMMON STOCK NUMBER SHARES ------------ ------------- QNTS- ------------ ------------- INCORPORATED UNDER THE SEE REVERSE FOR LAWS OF DELAWARE CERTAIN DEFINITIONS CUSIP 748798 10 5 THIS CERTIFIES THAT IS THE OWNER OF FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $0.001 PAR VALUE, OF - ----------------------------- QUINTUS CORPORATION ------------------------------ transferable on the books of the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of this Certificate properly endorsed. This Certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar. WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. Dated: /s/ SUSAN SALVESEN /s/ ALAN K. ANDERSON --------------------- ----------------------- SECRETARY CHIEF EXECUTIVE OFFICER [QUINTUS CORPORATION CORPORATE SEAL] COUNTERSIGNED AND REGISTERED: ChaseMellon Shareholder Services, L.L.C. (New York, New York) TRANSFER AGENT AND REGISTRAR BY: -------------------------------------------------- AUTHORIZED SIGNATURE 2 257434B QX 103 Tuesday, November 2, 1999 10:22:27 QUINTUS CORPORATION ---------------------------- The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM -- as tenants in common UNIF GIFT MIN ACT -- ...................Custodian............... TEN ENT -- as tenants by the entireties (Cust) (Minor) JT TEN -- as joint tenants with right of under Uniform Gifts to Minors survivorship and not as tenants Act........................................ in common (State) Additional abbreviations may also be used though not in the above list. FOR VALUE RECEIVED,___________________________hereby sell, assign and transfer unto PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE - -------------------------------------- - -------------------------------------- _______________________________________________________________________________ (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE) _______________________________________________________________________________ _______________________________________________________________________________ ________________________________________________________________________ Shares represented by the within Certificate, and do hereby irrevocably constitute and appoint ______________________________________________________________________ Attorney to transfer the said shares on the books of the within-named Corporation with full power of substitution in the premises. Dated________________________ ------------------------------------------------ NOTICE: THE SIGNATURE TO THE ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE, IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER. SIGNATURE(S) GUARANTEED: _______________________________________________________ THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.