IP and MAC address management in Jabber

Hey,

I am wondering how IP addresses and MAC addresses are managed in a 
Jabber server.

I see that for security reason, when user A talks to user B through a 
jabber server, IP address is not shown. Is it the same for the MAC address ?
(I guess that if user B perform a netstat -n the IP address shown on 
XMPP port will be the jabber server one, right ?)

When going into a voice chat, is it still using the same security rules 
? Is voice also transitting through the Jabber server ? Or is there a 
local SIP server created ?

Thanks for your time!
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