The agency succeeded in a pitch against WCRS, JWT and M&C Saatchi. The Haystack Group handled the pitch.
AKQA, meanwhile, is understood to have won the group's digital business in a pitch against Brand Union, Good Technology and Poke.
SwitchCo is the working group set up by the Government to co-ordinate the country's switch from analogue to digital television, set to take place between 2008 and 2012.
It is made up of the public-service broadcasters the BBC, ITV, Channel 4 and five, and the digital terrestrial TV operators Crown Castle UK and SDN. All members will provide money for the venture, but the BBC will supply the bulk of the funding.
The non-profit organisation will also work closely with the Department of Trade and Industry, the Department for Culture, Media and Sport and the media regulator, Ofcom.
Ford Ennals, the former managing director of Universal Group Direct and the marketing director at Lloyds TSB, is heading the organisation as its chief executive, while Barry Cox, the deputy chairman of Channel 4, is the group's chairman.