Google Inc said Apple Inc rejected its Google Voice application for the popular iPhone, contradicting Apple's statement to regulators last month.
The issue prompted the Federal Communications Commission to send letters to the companies and AT&T Inc, the iPhone's exclusive carrier, seeking explanations.
According to redacted material made public on the FCC's website on Friday, Google said it was told of the rejection by Apple representatives after a series of meetings, phone calls and emails.
In its response letter, Apple said it had not rejected the application and was still studying it because it appears to replace the iPhone's core mobile telephone functionality and user interface with its own system for telephone calls, text messaging and voicemail.
(Reporting by John Poirier; Editing by Steve Orlofsky)