According to a 109-page thread on the Apple Support Communites forum, the problem cropped up when the iPhone 4S was launched in November 2011 only to remain unfixed when iOS 5.0.1 was released a month later to deal with battery life complaints, and a look at the new build of an update seeded to developers shows that the audio issues will likely remain unresolved, reports GigaOM.
The issue was first identified when a number of Apple Community forum members began to complain that the audio on their iPhone 4S was intermittently failing when placing calls, forcing them to hang up and dial again. Interestingly, recipients on the other end were unaffected and could reportedly hear the iPhone user who originated the call.
The reports are fairly widespread as the Apple forum thread alone is still very active and now has well over 1,600 replies. Some are reporting a 1 in 10 audio failure rate, while others are seeing multiple back-to-back calls experiencing the problem.
It is unclear what is to blame for the audio failure, and although most calls go through without a problem, some users have reported the issue becoming bad enough that they needed to reboot their device.
Some forum members posit that the iOS software is to blame as the problem is not exclusive to the 4S and has been seen on previous generation iPhone 4 models running iOS 5. Others suggest the issue arises from new hardware in the 4S and its inability to communicate with carriers' networks.
Affected users were hoping that the issue would be resolved when iOS 5.0.1 was released, though it seems that the problem remains. The newest build of the iOS, now in the hands of developers, also reportedly doesn't address the situation.
Although no conclusive solution has been found for "Audiogate," as some forum members have taken to calling it, workarounds have been found and include using a bluetooth headset, placing the call through Siri and completing a full restore of handset software.
Apple has yet to make any official statement regarding the matter.