An FCC letter to Google is expected to be sent later Friday, they said.
At the heart of the inquiry is the allegation that Google may be blocking calls to certain numbers with high access charges.
Google reserves the right to restrict outgoing calls to some phone numbers, including adult chat lines and conference-call centers, which charge higher access fees to carriers. Blocking such calls reduces Google's expenses for the service.
AT&T Inc. has cried foul about the practice, saying Google is violating rules that were designed to ensure that phone companies will connect all calls. Earlier this week a group of lawmakers asked the FCC for an investigation into the matter, saying the practice could hurt rural customers.
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