Nexus 4 does not ring for calls on google talk or viper when screen is locked. Directly when the screen is unlocked, I see the caller calling, even if he already long time ago stopped ringing!
The Nexus 4 is running 4.2.2.
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So after some search and posting on some other forums, it turns out that it is a bug.
I'm quoting here from Rizy7 @ Android central forums:
"Known problem with Nexus 4 WiFi.. Google have been made aware but nothing has happened so far.. Hopefully in the next update it will be fixed. To get around the problem you either need to get a new router, set a static arp on your router or you need to change some system files which means you need a rooted device."