The task, which was split between WPP's Rainey Kelly Campbell Roalfe/Y&R in Europe and Ogilvy & Mather in the US, will be moved into one of Omnicom's agencies in New York.
The global business-to-business task will entail the promotion of BT's products and B2B solutions in multiple markets. RKCR/Y&R's grip on BT's UK business-to-business account, which it picked up in February 2006, along with the global business, is understood to be unaffected by the move.
The decision follows last week's news that BT has moved its £55 million media planning business out of its in-house media department and into WPP's Mediaedge:cia.
The telecoms giant shifted the account in-house in August 2006, when it terminated its contract with PHD over conflict with Yell and Pipex.
In the UK, Omnicom's Abbott Mead Vickers BBDO handles the consumer advertising account.