iPhone 4S Call Audio Issues May Not be Fixed in iOS 5.1

Apple is yet to fix the call audio bugs plaguing iPhone 4S users (and maybe even iPhone 4 users) that we had reported couple of months back.

In the last two months, the discussion thread on Apple's website that was opened on the issue has gone from 36 pages to a whopping 110 pages, indicating that the issue is affecting many iPhone users.

One user on the forum, who initiated the thread complaints:

Picked up a Verizon iPhone 4S - 32GB and on about 1 in 10 calls I get no outbound audio when dialing.  Call shows the timer counting as if the call is progressing but absolutely no ring back and cannot hear the party on the other end when they answer.

Another user on AT&T chimes in:

I am having the same issue with an AT&T 32G 4s, hitting the speaker button only works sometimes. It also has happened to me when using the Apple provided headphones/microphone.

According to the user complaints, the problem is intermittent.

We were hoping that the issue will be fixed in iOS 5.1 that is currently available to developers for beta testing. Unfortunately, AppleInsider reports that the issue is not yet fixed in the latest beta version of iOS 5.1:

Some iPhone 4S owners have been experiencing a sporadic yet persistent issue that mutes all audio when a user places a call, and new reports claim that Apple's upcoming iOS 5 build will leave the problem unsolved.

However, Apple has not released a new beta version of iOS 5.1 for more than three weeks so there is still hope that Apple will fix the issue (assuming it is a software bug) in the final version of iOS 5.1 that would be released to iPhone users.

Have you experienced any such issue on your iPhone 4S or iPhone 4? Have you figured out a workaround to fix the issue?