The UK's equality watchdog will write to the BBC requesting information after claims of wage inequality by its former China editor Carrie Gracie.
The Equality and Human Rights Commission (EHRC) said it would consider whether further action based on the BBC response is required.
Ms. Gracie said she resigned because she could not "conspire" in a policy of "illegal wage discrimination."
The BBC said that "equity in payment" was "vital" to the corporation.
In a statement, EHRC said: "Women have the legal right to equal pay with men for equal work."
The watchdog said it was aware of Ms. Gracie's assertions and would write to the BBC, "requiring them to provide us with information about their salary policy and the facts in this individual case."
He added: "We will consider whether additional actions based on this information are required."
He said a new requirement for thousands of companies to report on the gender wage gap "would do more to end discrimination" in the workplace.
Mrs. Gracie, who worked at the BBC for 30 years and directed her coverage in China since 2004, resigned as editor of the BBC in China after saying that she discovered a "huge gap" between her salary of £ 135,000 a year and that of her male counterparts.
In a salary disclosure last year, the American publisher Jon Sopel was included in the list with a salary of between £ 200,000 and £ 249,999, while the Middle East editor Jeremy Bowen won between £ 150,000 and £ 199,999.  "When I started work in China, I said that I will only do this job if I am paid equally," Gracie told BBC News.
"And in July of 2017 I discovered the huge gap that the two men – who were international publishers – earned 50% more at least than the two women who were international ional editors."
She said she had rejected an increase of £ 45,000 as it still left a "big gap" between her and her male counterparts when all she wanted was to be "made equal".
He added: "What I'm talking about is wage discrimination, when men are paid more for doing the same job or a job of different value, now that's illegal."
The BBC conducted an audit of the payment of the majority of its staff and is now doing a separate review of the personnel on the air.
A spokesperson for the BBC said: "A significant number of organizations have released their gender pay figures that show that we are doing much better than many and are well below the national average."
Jennifer's employment lawyer Millins, who represents several women who take cases against the BBC, said that Ms. Gracie's case could "give some answers" to other complainants.
"Carrie was very clear in saying that she did not want to be paid more, she wanted equality," he told BBC Two & # 39; s Newsnight.
Up to 200 women from different levels of the BBC have submitted complaints about payments, according to BBC Women, a group of around 150 broadcasters and producers.
Sian Kevill, former director of BBC World News, said she was "quite surprised" by the wage disparity among international publishers.
"When you have the same job title, it seems to denote that you have approximately the same salary," he told Newsnight.
But he added that the payment could be "very complicated" if someone is hired externally, but has a higher salary because they work in a competitive field or have worked in war zones, for example.