<Page> EXHIBIT 99.1 AVAYA 2002 INVESTMENT COMMUNITY MEETING GARRY K. MCGUIRE CFO AND SENIOR VP OF OPERATIONS - -------------------------------------------------------------------------------- <Page> Q4 FY02 EXIT RATE <Table> <Caption> Q4'02 Q4'02 EXIT ACTUAL RATE COMMENTS - ---------------------------------------------------------------------------------------------------- Revenues............................. 1,152 1,152 Gross Margins........................ 442 454 Obsolete inventory 38.4% 39.4% SG&A................................. 343 355 One-time savings and miscellaneous items 29.8% 30.8% R&D.................................. 105 106 9.1% 9.2% Operating Income..................... (6) (7) (0.5%) (0.6%) Other Inc/(Exp)...................... (10) 2 Writedown of certain equity investments Interest Expense..................... 18 17 Pre-tax Inc/(Loss)................... (34) (22) </Table> 2 <Page> ACHIEVING BREAKEVEN IN Q3 FY03 - - IN Q3 FY03 THE COMPANY WOULD ACHIEVE BREAKEVEN AT $1,075M - - KEY ASSUMPTIONS: -- FULL FLOW THROUGH OF RESTRUCTURING SAVINGS: $67M -- MANUFACTURING EFFICIENCIES -- PARTIALLY OFFSET BY INCREASES IN PENSION AND INSURANCE COSTS 3 <Page> ACHIEVING BREAKEVEN IN Q3 FY03 - - OTHER ACTIONS ARE AVAILABLE TO OFFSET FURTHER REVENUE DECLINE - UP TO $50M RESTRUCTURING CHARGE AVAILABLE UNDER BANK FACILITY (PAYBACK NO MORE THAN SIX MONTHS) - BREAKEVEN LEVEL CAN BE LOWERED FURTHER - STRONG FINANCIAL DISCIPLINE ON EXPENSES AT ALL LEVELS 4 <Page> ACHIEVING BREAKEVEN IN Q3 FY03 BASED ON ACTIONS TO DATE <Table> <Caption> Q4'02 Q4'02 Q3'03 ACTUAL EXIT RATE BREAKEVEN COMMENTS - ----------------------------------------------------------------------------------------------------- Revenues........................ 1,152 1,152 1,075 7% decline Gross Margins................... 442 454 443 Manufacturing savings, BRR savings 38.4% 39.4% 41.2% SG&A............................ 344 355 328 BRR savings, partially offset by pension, insurance costs 29.8% 30.3% 30.5% R&D............................. 105 106 97 Slight decline 9.1% 9.2% 9.0% Operating Inc................... (6) (7) 17 (0.5%) (0.6%) 1.6% Other Income.................... (10) 2 -- Interest Expense................ 18 17 17 Pre-tax Inc/(Loss).............. (34) (22) 0 Breakeven level reached </Table> 5 <Page> OPERATING LEVERAGE - - EVERY $100M OF INCREMENTAL REVENUE ABOVE THE BREAKEVEN POINT GENERATES $68M OF OPERATING INCOME <Table> REVENUE..................................................... $ 100M $ 300M GROSS MARGIN................................................ 72M 216M OPERATING INCOME............................................ 68M 203M </Table> Assumes all other conditions remain constant, eg, mix, margin, etc. 6 <Page> FY03 POTENTIAL USES OF CASH QUARTERLY DETAIL <Table> <Caption> ($ MILLIONS) Q1'03 Q2'03 Q3'03 Q4'03 TOTAL - ------------------------------------------------------------------------------------------------------------------ BRR & One-time Payments..................................... $52 $37 $20 $18 $127 Pensions.................................................... 8 38 45 Interest Expense............................................ 12 12 12 13 48 CAPEX....................................................... 19 19 19 19 76 --- --- --- --- ---- Total....................................................... 82 68 59 88 296 </Table> 7 <Page> BRR: FY03 EXPECTED SAVINGS <Table> <Caption> Q1'03 Q2'03 Q3'03 Q4'03 FY03 TOTAL - ---------------------------------------------------------------------------------------------------------------- Incremental Savings..................................... 37 12 2 51M Cumulative Savings...................................... 54 66 68 68 256M </Table> 8 <Page> BRR RESERVES AND EXPECTED CASH USAGE <Table> BRR BALANCE AS OF Q3 FY2002................................. $109M + NEW BRR CHARGE (46M+74M)................................ 120M -- USAGE FOR EMPLOYEE SEPARATIONS......................... (29)M -- USAGE FOR LEASE OBLIGATIONS............................ (10)M -- REVERSAL OF PRIOR RESERVES............................. (20)M ----- BRR BALANCE AS OF Q4 FY2002................................. $170M ===== </Table> <Table> <Caption> Q1 Q2 Q3 Q4 CASH USAGE FY03 FY03 FY03 FY03 FY04/+ TOTAL - ------------------------------------------------------------------------------------------------------------------ BRR.............................................. 46M 34M 18M 17M 55M $170M One-Time......................................... 6M 3M 2M 1M 4M $ 16M </Table> 9 <Page> EXPECTED MINIMUM CASH POSITION - - CASH AT END OF Q1'03 = $600M - - MINIMUM CASH AT 9/30/03 = $500M <Table> <Caption> ASSUMING ($ MILLIONS) BREAKEVEN - ------------------------------------------------------------------------------------------- Pre-tax Income- Breakeven................................... $ 0 BRR SAVINGS $240M EBITDA...................................................... 270 Changes in Working Capital: BRR....................................................... (127) Other Working Capital..................................... 150 Capital Expenditures........................................ (75) Other Uses.................................................. (89) Increase.................................................... 129 </Table> 10 <Page> 2003 AND BEYOND: MAINTAINING OUR FINANCIAL DISCIPLINE - - FORECASTING FUTURE IS DIFFICULT -- STATE OF US AND WORLD ECONOMY -- TECHNOLOGY TRANSITION RATE IS HARD TO PREDICT - - FINANCIAL DISCIPLINE REQUIRED -- WE ARE MANAGING WHAT WE CAN CONTROL - COSTS - CASH MANAGEMENT - BALANCE SHEET 11 <Page> WHY AVAYA? - - CASH: -- MAINTAIN AND STRENGTHEN OUR FINANCIAL POSITION - - EARNINGS: -- ACHIEVE BREAKEVEN BY Q3 FY03 - - GROWTH: -- GENERATE SUSTAINABLE PROFITABILITY BY STABILIZING & GROWING REVENUES 12 <Page> OUR COMMITMENT - - WE WILL STAY CLOSE TO OUR MARKETS IN ORDER TO LEVERAGE AND CAPITALIZE ON THE POTENTIAL OF OUR LARGE, DIVERSE INSTALLED CUSTOMER BASE - - WE HAVE THE PRODUCTS AND THE PEOPLE TO SUCCESSFULLY COMPETE, AND EVEN IN THE CURRENT ENVIRONMENT THERE IS EVIDENCE THAT WE ARE CAPTURING MARKET SHARE AND MIND SHARE - - WE WILL CONTINUOUSLY WORK TO IMPROVE EVERY ASPECT OF OUR BUSINESS IN ORDER TO OPERATE AS EFFECTIVELY AND EFFICIENTLY AS POSSIBLE - - WE WILL MAINTAIN AND STRENGTHEN THE COMPANY'S FINANCIAL FOOTING -- OUR LIQUIDITY IS STRONG AND THERE ARE ADDITIONAL STEPS WE ARE EXPLORING TO FURTHER SOLIDIFY THE POSITION 13