Carrier AT&T: Dropped call audio issue with 6s, iOS 9.2+

[cnick6]

Has anyone else been seeing dropped call audio with their 6s and iOS 9.2 or higher?

I'm pretty sure this started with 9.2 but here's what happens:

After I leave work each day, I turn on my Voyager Legend BT headset and make a call.
During that call, (in almost the same location), there's suddenly dead-audio but the phone still shows the call in-progress. I can't hear my party and they can't hear me... both of us still show active calls however.
I have to hang up and call again to re-establish the connection.

At times, we've had this dead-audio for several minutes before realizing the call audio was gone.

A few things I haven't confirmed:

Is this a carrier issue? (So far, I haven't seen/heard any issues from T-Mobile friends.)
Could it be a cell-tower/switching issue? (I've seen this issue in the same area multiple times.)
Could it be a BT headset issue? (Since I use my headset while driving several miles it's hard to test without it.)

BTW, while in the call with dead-audio, I've tried switching to phone or speaker audio with no luck -- so the baseband connectino has definitely dropped -- but iOS 9.2.1 seems to think the call is still active.

So far, this has never happened when I'm not moving between cell towers.

Anyone else see this issue?

 

[theshoehorn]

Sounds to me like an AT&T issue. I have the 6 Plus (VoLTE), and I know on my drive to/from work there are certain locations I can always count on having some what dead air for a couple seconds. Possibly a bad handoff between towers. Sometimes i think too far of a distance between them.

 

[karpeltunnel10]

Visit your local corporate store and request them to put a new SIM card in your phone. You can also download an app called AT&T Mark the Spot and report it. After so many reports techs will visit the towers near that location to see if anything is wrong with them.

 

[cnick6]

Thanks for the suggestions. I enabled Baseband logging today and was able to reproduce the problem going just a few miles from work -- a different route than before -- so it's something consistent. Hopefully the captures will help Apple figure it out.

I agree it sounds like a tower issue -- but I've read some [new] user reports about the Voyager Legend headset having random issues with 9.2+ as well -- so wasn't sure if it could be the culprit.

I suppose the Phone application could be dropping the call audio between the BT Handset but switching to another source should fix that problem.
[doublepost=1455357976][/doublepost]I filed Apple bug 24643317 on this issue. I'll update the thread if/when Apple responds.