**Exhibit 21**

**AVAYAINC.Subsidiaries of the Registrant**
| Company Name                                | ** ** | ** **                       | ** ** | **Jurisdiction/State   of   incorporation/formation** |
|---------------------------------------------|------------|----------------------------------|------------|-------------------------------------------------------|
| Avaya Argentina S.R.L.                      |       | Argentina                        |
| Avaya  Asia Pacific Inc.                    |       | Delaware                         |
| Avaya Australia Pty.  Ltd.                  |       | Australia                        |
| Avaya Austria GmbH                          |       | Austria                          |
| Avaya Belgium SPRL                          |       | Belgium                          |
| Avaya Beteiligungs GmbH                     |       | Germany                          |
| Avaya Brasil Ltda.                          |       | Brazil                           |
| Avaya  CALA Inc.                            |       | Delaware                         |
| Avaya Canada Corp.                          |       | Canada                           |
| Avaya  Capital Ireland                      |       | United Kingdom                   |
| Avaya Chile Limitada                        |       | Chile                            |
| Avaya (China)  Communications Co., Ltd.     |       | People’s Republic  of China |
| Avaya CIS                                   |       | Russian  Federation              |
| Avaya  Communicacion Espana, S.L.U.         |       | Spain                            |
| Avaya Communication de  Colombia S.A.       |       | Colombia                         |
| Avaya Communication de  Mexico S.A. de C.V. |       | Mexico                           |
| Avaya Communication  Israel Ltd.            |       | Israel                           |
| Avaya Croatia                               |       | Croatia                          |
| Avaya Cyprus Investments  Limited           |       | Cyprus                           |
| Avaya Czech Republic  s.r.o.                |       | Czech Republic                   |
| Avaya Denmark ApS                           |       | Denmark                          |
| Avaya Deutschland GmbH                      |       | Germany                          |
| Avaya  ECS Limited                          |       | United Kingdom                   |
| Avaya EMEA Ltd.                             |       | Delaware                         |
| Avaya Finance  GmbH & Co KG        |       | Germany                          |
| Avaya France SAS                            |       | France                           |
| Avaya GCM Sales Limited                     |       | Ireland                          |
| Avaya German Holdco GmbH                    |       | Germany                          |
| Avaya Germany GmbH                          |       | Germany                          |
| Avaya (Gibraltar)  Investments Limited      |       | Gibraltar                        |
| Avaya GlobalConnect  Ltd.*                  |       | India                            |
| Avaya GmbH &  Co. KG               |       | Germany                          |
| Avaya  Holding EMEA B.V.                    |       | Netherlands                      |

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| Avaya Holdings LLC                       |   | Delaware        |
|------------------------------------------|--------|-----------------|
| Avaya Holdings Ltd.                      |   | Bermuda         |
| Avaya  Holdings Two, LLC                 |   | Delaware        |
| Avaya Hong Kong Company  Ltd.            |   | Hong Kong       |
| Avaya Hungary Ltd.                       |   | Hungary         |
| Avaya India Pvt. Limited                 |   | India           |
| Avaya  Integrated Cabinet Solutions Inc. |   | Delaware        |
| Avaya International  Enterprises Limited |   | Luxembourg      |
| Avaya International LLC                  |   | Delaware        |
| Avaya International  Sales Limited       |   | Ireland         |
| Avaya Ireland Limited                    |   | Ireland         |
| Avaya Italia S.p.A                       |   | Italy           |
| Avaya Japan Ltd.                         |   | Japan           |
| Avaya Korea Ltd.                         |   | Korea           |
| Avaya  Licensing LLC                     |   | Delaware        |
| Avaya  Limited                           |   | United Kingdom  |
| Avaya Luxembourg  Holdings SARL          |   | Luxembourg      |
| Avaya Luxembourg  Investments S.a.r.l    |   | Luxembourg      |
| Avaya Macau Limitada                     |   | China           |
| Avaya (Malaysia) Sdn.  Bhd.              |   | Malaysia        |
| Avaya Management GmbH                    |   | Germany         |
| Avaya  Management Services Inc.          |   | Delaware        |
| Avaya (Mauritus) Ltd.                    |   | Mauritus        |
| Avaya Nederland B.V.                     |   | Netherlands     |
| Avaya Panama Ltda.                       |   | Panama          |
| Avaya Peru S.R.L.                        |   | Peru            |
| Avaya Philippines Inc.                   |   | Philippines     |
| Avaya Poland Sp. z.o.o.                  |   | Poland          |
| Avaya Puerto  Rico, Inc.            |   | Puerto Rico     |
| Avaya  Singapore Pte. Ltd.               |   | Singapore       |
| Avaya  Slovakia s.r.o.                   |   | Slovak Republic |
| Avaya Slovenia ddo                       |   | Slovenia        |
| Avaya  Sweden AB                         |   | Sweden          |
| Avaya  Switzerland GmbH                  |   | Switzerland     |
| Avaya  Technology LLC                    |   | Delaware        |
| Avaya—Tenovis Management  GmbH      |   | Germany         |

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| Avaya—Tenovis Service GmbH                   |   | Germany        |
|---------------------------------------------------|--------|----------------|
| Avaya  UK                                         |   | United Kingdom |
| Avaya  UK Holdings Limited                        |   | United Kingdom |
| Avaya Venezuela S.R.L.                            |   | Venezuela      |
| Avaya  World Services Inc.                        |   | Delaware       |
| Comergo GmbH                                      |   | Germany        |
| GlobalConnect Australia  Pvt. Ltd.                |   | Australia      |
| Monterey  Acquisition Corp.                       |   | Delaware       |
| Mosaix  Ltd.                                      |   | United Kingdom |
| Network  Alchemy Ltd.                             |   | United Kingdom |
| 3102455  Nova Scotia Company                      |   | Canada         |
| Nimcat  Networks Partnership*                     |   | Canada         |
| Octel  Communications LLC                         |   | Delaware       |
| Octel  Communications Ltd.                        |   | United Kingdom |
| Octel  Communications Services Ltd.               |   | United Kingdom |
| P.T. Avaya Indonesia                              |   | Indonesia      |
| Rhetorex  Europe Ltd.                             |   | United Kingdom |
| Soundlogic Acquisition  ULC                       |   | Canada         |
| Spectel Ltd.                                      |   | Ireland        |
| Spectel Operations Ltd.                           |   | Ireland        |
| Spectel Research Ltd.                             |   | Ireland        |
| Spectel Systems Ltd.                              |   | Ireland        |
| Spectel  UK Limited                               |   | United Kingdom |
| Technology  Corporation of America, Inc.     |   | Delaware       |
| Tenovis Comergo GmbH                              |   | Germany        |
| Tenovis Direct GmbH*                              |   | Germany        |
| Tenovis France S.A.S.                             |   | France         |
| Tenovis Netherlands B.V.                          |   | Netherlands    |
| Tenovis Newtel s.r.l.                             |   | Italy          |
| Tenovis S.A.S.                                    |   | France         |
| Tenovis s.r.l., Italy                             |   | Italy          |
| Tenovis Telecom  Frankfurt GmbH & Co. KG |   | Germany        |
| VPNet  Technologies, Inc.                    |   | Delaware       |
| Agile Software NZ Limited*                        |   | New Zealand    |

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*                    owns less than100%

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