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Exhibit 21 Subsidiaries of the Registrant Organizedunder the laws of1328556 Ontario Inc.
    
    Ontario, CanadaAlteon WebSystems AB
    
    SwedenAlteon WebSystems International Limited
    
    BermudaAlteon WebSystems International, Inc.
    
    State of Delaware, U.S.A.Alteon WebSystems, Inc.
    
    State of Delaware, U.S.A.Architel Systems (U.S.) Corporation
    
    State of Delaware, U.S.A.Architel Systems (UK) Limited
    
    United KingdomArchitel Systems Corporation
    
    CanadaBrightspeed SAS
    
    FranceCapital Telecommunications Funding Corporation
    
    CanadaCoreTek, Inc.
    
    State of Delaware, U.S.A.CTFC Canada Inc.
    
    CanadaGuandong-Nortel Telecommunications Equipment Company Limited
    
    Peoples Republic of ChinaMatra Communication Cellular Terminals GmbH
    
    GermanyNortel Communications Holdings (1997) Limited
    
    IsraelNortel Comunicaciones de Colombia S.A.
    
    ColombiaNortel de Mexico, S. de R.L. de C.V.
    
    MexicoNortel Finance France SAS
    
    FranceNortel Networks (Asia) Limited
    
    Hong KongNortel Networks (Austria) GmbH
    
    AustriaNortel Networks (CALA) Inc.
    
    State of Florida, U.S.A.Nortel Networks (China) Limited
    
    Peoples Republic of ChinaNortel Networks (India) Private Limited
    
    New Delhi, IndiaNortel Networks (Luxembourg) S.A.
    
    LuxembourgNortel Networks (Scandinavia) AS
    
    Oslo, NorwayNortel Networks (Shannon) Limited
    
    IrelandNortel Networks (Thailand) Ltd.
    
    ThailandNortel Networks AB
    
    SwedenNortel Networks AG
    
    SwitzerlandNortel Networks Applications Management Solutions Inc.
    
    State of Delaware, U.S.A.Nortel Networks AS
    
    NorwayNortel Networks Australia Pty. Limited
    
    AustraliaNortel Networks BV
    
    The NetherlandsNortel Networks Capital Corporation
    
    State of Delaware, U.S.A.Nortel Networks Chile S.A.
    
    ChileNortel Networks Communications (Israel) Limited
    
    IsraelNortel Networks de Argentina S.A.
    
    ArgentinaNortel Networks de Colombia S.A.
    
    ColombiaNortel Networks de Mexico S.A. de C.V.
    
    MexicoNortel Networks de Panama S.A.
    
    Republic of PanamaNortel Networks de Venezuela Compania Anonima
    
    VenezuelaNortel Networks del Ecuador S.A.
    
    Republic of EcuadorNortel Networks del Uruguay S.A.
    
    UruguayNortel Networks Engineering Service Kft
    
    HungaryNortel Networks Engineering Services Co. Ltd.
    
    Peoples Republic of ChinaNortel Networks Employee Benefit Trustee Company Limited
    
    United KingdomNortel Networks Europe Sales Limited
    
    IrelandNortel Networks Finance LLC
    
    State of Delaware, U.S.A.Nortel Networks France SAS
    
    FranceNortel Networks Germany GmbH & Co. KG
    
    GermanyNortel Networks Germany Verwaltungs-GmbH
    
    GermanyNortel Networks Global Corporation
    
    CanadaNortel Networks GmbH
    
    GermanyNortel
Networks Hellas Ltd.
    
    Athens, GreeceNortel Networks Hispania, S.A.
    
    SpainNortel Networks HPOCS (Denmark) Holding A/S
    
    Denmark (Copenhagen)Nortel Networks HPOCS (Denmark) Holding Aps
    
    Denmark (Copenhagen)Nortel Networks HPOCS Inc.
    
    State of Delaware, U.S.A.




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Organizedunder the laws ofNortel Networks Inc.
    
    State of Delaware, U.S.A.Nortel Networks India International Inc.
    
    State of Delaware, U.S.A.Nortel Networks International Corporation
    
    CanadaNortel Networks International Finance & Holding B.V
    
    The NetherlandsNortel Networks International Inc.
    
    State of Delaware, U.S.A.Nortel Networks Japan
    
    JapanNortel
Networks Israel (Sales and Marketing) Limited
    
    IsraelNortel Networks Korea Limited
    
    KoreaNortel Networks Limited
    
    CanadaNortel Networks Malaysia Sdn. Bhd.
    
    MalaysiaNortel Networks Mauritius Ltd.
    
    MauritiusNortel Networks N.V.
    
    BelgiumNortel Networks New Zealand Limited
    
    New ZealandNortel Networks O.O.O.
    
    RussiaNortel Networks Optical Components Inc.
    
    State of Delaware, U.S.A.Nortel Networks Oy
    
    FinlandNortel Networks Peru S.A.C
    
    PeruNortel Networks Polska Sp. z o.o.
    
    PolandNortel Networks Romania Srl
    
    RomaniaNortel Networks S.A.
    
    FranceNortel Networks S.p.A.
    
    ItalyNortel Networks S.R.O
    
    Czech RepublicNortel Networks Singapore Pte Ltd.
    
    SingaporeNortel Networks Slovensko, s.r.o.
    
    Slovak RepublicNortel Networks South Africa (Proprietary) Limited
    
    South AfricaNortel Networks Southeast Asia Pte. Ltd.
    
    SingaporeNortel Networks Technology (Thailand) Ltd.
    
    ThailandNortel Networks Technology Corporation
    
    Nova Scotia, CanadaNortel Networks Technology Ltd.
    
    Cayman IslandsNortel Networks Telecommunications Equipment (Shanghai) Co., Ltd.
    
    Peoples Republic of ChinaNortel Networks Telecomunicacoes do Brasil Comercio e Servicos Ltda.
    
    BrazilNortel Networks Telecomunicacoes do Brasil Industria e Comercio Ltda.
    
    State of Sao Paolo, BrazilNortel Networks Telecomunicacoes Servicos e Participacoes Ltda.
    
    BrazilNortel Networks U.S. Finance Inc.
    
    State of Delaware, U.S.A.Nortel Networks UK Limited
    
    United KingdomNortel
Telecomunicaciones S.A.
    
    ColombiaNorthern Telecom (Portugal) S.A.
    
    PortugalNorthern Telecom France S.A.
    
    FranceNorthern Telecom International Inc.
    
    State of Delaware, U.S.A.PT Nortel Networks Indonesia
    
    IndonesiaQtera Corporation
    
    State of Delaware, U.S.A.Regional Telecommunications Funding Corporation
    
    CanadaShenyang Nortel Telecomunications Co., Ltd.
    
    Peoples Republic of ChinaSonoma Systems
    
    State of California, U.S.A.TSFC Canada Inc.
    
    CanadaXros, Inc.
    
    State of Delaware, U.S.A.