ZenithOptimedia's Zed division continues to handle the search for the rest of BT's online Business and Consumer operations.
Bigmouthmedia's BT deal, which includes paid-for and natural search, is one of a number of recent wins for the UK's largest independent search marketing agency, which now has more than 300 customers.
Separately, the Edinburgh-based search specialist has also added the community website network AboutMyArea to its roster of clients.
The independent digital agency will provide a range of search engine optimisation and analysis designed to boost the site's appeal.
The partnership will, in the first instance, target a site overhaul designed to optimise search engine performance.
Lyndsay Menzies, managing director of Bigmouthmedia UK, said: "In the global marketplace, people have often overlooked the opportunities that are right on their doorstep, but the web is increasingly beginning to get local, and AboutMyArea is one of the operations leading the charge."
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