Wire diagramm for 4 pin Headset plug on iOS devices

How is the wire diagram for the 4 pin plug for Earphone/Headset plug for iOS Devices, such as iPhone, iPad etc.? I read somewhere that there must be a 1,5k resistor between Mic and Speaker, which has to do with the switch to take a call on the standard apple headset. Is that true?

Yeah, I've tried 5 out of the 7 steps shown in their troubleshooter.  The sixth step is one that is a major pain and I doubt would fix the problem: Reinstall iTunes.  I know enough about PCs to feel about 80% confident that this step would not fix the issue.  Plus, it's a major hassle with re-adding music to the collection.  Nevertheless, I will look at it as a last ditch effort.
The seventh step is extremely vague and doesn't really help.  "There might be a software conflict."  Fine, but there's no way to find any such conflict, if one even exists in the first place, without a heavy dose of trial-and-error, several hours of time, dozens of reboots, and the patience of Job.
However, they do list some other steps that I'll try when I get home, such as making sure certain services are installed and running.  I'll post my results here.  Thanks, wiclee.

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