Where did the SIP settings go to on my LG Optimus 4X?
That sip settings are hidden in "activities" below "Telefon", it took me a while to find it. Creating a SIP Account was possible but it was not stored permanently. After closing the sip settings and opening it again it's gone. Still using Vimtura Vimphone as sip dialer.

LG P880 fw v.20b, Android 4.1.2