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EXHIBIT 21 Subsidiaries of the Registrant Organizedunder the laws of1328556 Ontario Inc.
    
    OntarioBrightspeed SAS
    
    FranceCapital Telecommunications Funding Corporation
    
    CanadaCTFC 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 AS
    
    NorwayNortel 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 Employee Benefit Trustee Company Limited
    
    United KingdomNortel Networks Engineering Service Kft
    
    HungaryNortel
Networks Engineering Services Co. Ltd.
    
    Peoples Republic of ChinaNortel Networks Europe Sales Limited
    
    IrelandNortel Networks Finance LLC
    
    State of Delaware, U.S.A.Nortel Networks France SAS
    
    FranceNortel Networks Germany Verwaltungs-GmbH
    
    GermanyNortel Networks Global Corporation
    
    CanadaNortel Networks GmbH
    
    GermanyNortel Networks Germany GmbH & Co. KG
    
    GermanyNortel Networks Hellas Ltd.
    
    Athens, GreeceNortel Networks Hispania, S.A.
    
    SpainNortel Networks HPOCS Inc.
    
    State of Delaware, U.S.A.Nortel Networks Inc.
    
    State of Delaware, U.S.A.Nortel Networks India International Inc.
    
    State of Delaware, U.S.A.




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Organizedunder the laws ofNortel Networks International Corporation
    
    CanadaNortel
Networks International Finance & Holding B.V.
    
    The NetherlandsNortel Networks International Inc.
    
    State of Delaware, U.S.A.Nortel Networks Israel (Sales and Marketing) Limited
    
    IsraelNortel Networks Japan
    
    JapanNortel Networks Korea Limited
    
    KoreaNortel
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 Pty. Limited
    
    AustraliaNortel 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 KingdomNorthern Telecom France S.A.
    
    FranceNortel Telecomunicaciones S.A.
    
    ColombiaNorthern Telecom (Portugal) S.A.
    
    PortugalNorthern Telecom International Inc.
    
    State of Delaware, U.S.A.PT Nortel Networks Indonesia
    
    IndonesiaRegional Telecommunications Funding Corporation
    
    CanadaShenyang
Nortel Telecommunications Co., Ltd.
    
    Peoples Republic of ChinaTSFC Canada Inc.
    
    CanadaQtera Corporation
    
    State of Delaware, U.S.A.