Sylvain Justier

Magenta (Paris)
Lawyer (Co-founder & Partner)

Sylvain Justier co-founded Magenta at the end of 2008. He was previously a senior associate with Bureau Francis Lefebvre and White & Case Paris. Sylvain Justier is specialized in French and European competition law and in law for deregulated sectors (in particular as concerns electronic communications and energy). He works in the following fields for French and foreign clients:
 actions before the Competition Council or the European Commission for anti-competitive practices, notifications of merger operations, actions for unfair competition and for private enforcement before commercial courts, etc.
 regular assistance to major telecom operators, both in the field of fixed telephony as well as mobile services and internet : preparation and negotiation of contracts for interconnection and access to fixed and mobile networks (unbundling agreements, MVNO contracts, bitstream, wholesale line rental, etc.), preparation of responses to public consultations initiated by ARCEP (the French telecoms regulator) and the European Commission, litigation before ARCEP and the French Competition Council, etc.
 in the area of energy, assistance to operators in negotiating and drafting contracts for access to networks and electricity purchasing, advising new players regarding the application of gas and electricity regulations, implementing industrial partnerships, etc.

Linked authors

Magenta (Paris)
UVSQ (Versailles)
Magenta (Paris)
Magenta (Paris)


4396 Bulletin

39340 Review

Jean-Paul Tran Thiet, Sylvain Justier Electronic communications: The French Competition Council and ARCEP are on the verge of adopting new generation networks (Very high speed broadband access fiber networks)


Conc. conc. opinion No. 08-A-06 of 6 May 2008 on a draft legislative provision concerning the development of very high-speed fibre optic networks (LME Bill) ARCEP, 18 June 2008, notification to the European Commission and public consultation on the analysis of the broadband and very high speed (...)

Jean-Paul Tran Thiet, Sylvain Justier Dispute settlement: The French audiovisual regulator settles a dispute enhancing the non-discrimination principle (AB Sat and Métropole Télévision)


CSA, dec. no. 2008-523 of 8 July 2008 relating to a dispute between AB Sat and Métropole Télévision The entry into force on August 5 of the law on the modernisation of the economy reinforced the principle of contractual freedom by abolishing the tort of discriminatory practice provided for (...)

Jean-Paul Tran Thiet, Sylvain Justier EU electronic communications regulator: The European Commission proposes to create an European electronic communications market regulator (Draft regulation)


EC Comm, 13 November 2007, Proposal for a Regulation of the European parliament and of the Council establishing the European Electronic Communications Market Authority, COM (2007) 699 As we noted in the previous issue of our review, on 13 November 2007, the European Commission presented its (...)

Jean-Paul Tran Thiet, Sylvain Justier Telecommunications: The ARCEP consults the sector about the development and the potential regulation of new generation networks (Networks New Generation)


ARCEP, July 27, 2007, public consultations on very high speed broadband (access to ducts and sharing of the terminal part of fibre networks) At the end of July 2007, ARCEP published two public consultations on the development of so-called "new generation" networks in France. At a time when (...)

Jean-Paul Tran Thiet, Sylvain Justier Telecommunications - Access to directories: The Regulator states the conditions under which operators should grant access to their directories to directory assistance service providers (Universal directories)


ARCEP, decree no. 06-0639 of November 30, 2006 specifying the conditions for making lists of subscribers and users available for the purpose of publishing universal directories or providing universal information services, JORF no. 71 of March 24, 2007. On March 8, 2007, the Minister Delegate (...)

Jean-Paul Tran Thiet, Sylvain Justier Telecommunications - Termination call: The regulator fixes price that mobile operators may charge in 2007 for termination call (ARCEP, dec. 14 september 2006)


ARCEP, dec. no. 06-0779 of September 14, 2006 on the pricing framework for "direct" voice call termination rates for 2007 for Orange France, Société Française du Radiotéléphone and Bouygues Telecom in France and abroad. In 2004, ARCEP analyzed the competitive situation in the markets for (...)

Jean-Paul Tran Thiet, Sylvain Justier, Vincent Jaunet Electricity - Joint-purchasing: The Legislator and the French Competition Council allow major industrial consumers to enter into long term joint purchasing agreements with electricity producers through consortium (Law, Dec., 30 2005 - Electro-intensives industries)


Law n° 2005-1720 of December 30, 2005 of rectifying finance for 2005 (Supply Consortium for the benefit of electro-intensive industries) Conc. conc. opinion No 05-A-23 of 5 December 2005 on a proposed scheme to allow electro-intensive industries to benefit from specific conditions for the (...)



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