Since I have installed iOS 6.1.3 on my iPhone 5 I have sometimes problems to start a phone call. Everything looks fine, but no ring tone... A workaround is to stop phone app in the multitasking bar. But this is more than inconvenient ;-) Any solution?

In this cases everything looks fine, but no ring tone is there and after sometimes the phone informs me that no connection can be estabilished (its a German phone, therefore I am not sure about the message in English systems). A workaround is to stop the telephone app in the multitasking bar (double click on home button, hold the app symbol pressed for some seconds, close app). Next several call work after this.
I am not sure if an incomming call would work in this mode...
Faces anybody the same problems or has solution for it?

Basic troubleshooting
Restart
Reset
Restore with backup
restore as new if required

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