[Serusers] chain of rtp proxies ...

Hi, I am currently testing a system which connects two "islands" ... each island has its own SER (0.9.6) + rtp proxy ... Actually there is NOT going to be NAT or firewall among them, but i still do want to proxy all RTP streams (sorry ... requirements). Probably even within the phones in the same island ... I have a few questions ... - i saw mentioned that chaining is possible ... no problem there right? i need to send an extra parameter to the force_rtp_proxy and that is it? no side-effects if, i.e, call between the phones in the same island (thus, just one rtp proxy)? - What would be the bare minimum config to force rtpproxy, without all the NAT tests? as said, i have no such problem, so i would like a minimal config: fix_nated_sdp and force_rtp_proxy? is that enough? - For testing purposes in my little lab ... can i run two SERs on the same box (that i know i can do :D ) ... which use the same rtpproxy on the box, thus via the same unix socket? just for testing ... they put me in a corner of an office with just a little table :) Regards, Cesc