Share your experience!
Hello,
When I connect my earphones, speakers become disable. All sounds, including Alerts or Ringing can be heard from the earphones and not from the speakers.
Thank you in advance,
Thanks for posting and welcome to the forum! 
I tried this out with a Live with Walkman running Android 4.0 and there was no such issue. Try updating your phone and hopefully the problem is way gone.
You can easily update with our program Sony PC Companion from the link below.
http://www.sonymobile.com/gb/tools/pc-companion/
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Greetings,
My Android version is 4.0.4 with Version number 4.1.B.0.587 and Kernel version 2.6.32.9-perf.
I can't remember if the problem appeared after the update or not.
Thank you,