Reinstalled those (and other dbus-related) packages, to no avail

It's worth to mention, that - with almost 100% probability - it must be something on /dev/mmcblk0p2 (home, opt) damaged, not a thing that resides on ubifs root. Having the latter filesystem damaged is highly unlikely/impossible.

Not that the above gives me any idea where to look next, though... Maybe device gets confused by not having SIP accounts set, while at the same time being connected to them? It's a shoot in the dark, but it COULD be trying to ask me if I want to send/call via GSM or VOIP, then get confused somehow... Where VoIP accounts data is stored, exactly? I could try purging it.

/Estel