calabar,
hi.
1. Yes, you have to provide a network log for each case you reported, core + Jabber (nothing else).
2. XMPP connector is provided by Google for compatibility purposes only, and it is known to be very poor in the matters of XMPP protocol implementation. Perhaps we need the separate protocol for Hangouts, but right now we have no free coders to do that.
WMBR, George Hazan.