I'm definitely favouring the B2BUA+SST approach here.
I really, really don't want to proxy media unless I have to; it makes
the bandwidth bill much higher, it lengthens many users' network path to
reach the carriers, and for no benefit whatsoever except in the case of
far-end NAT traversal, which applies to a minority of users. If
anything, the aggregate effect on QoS in my case is probably worse if I
relay RTP than if I don't.
The B2BUA+SST approach seems clean, efficient, and at least from a
theoretical point of view, rather reliable.
--
Alex Balashov - Principal
Evariste Systems LLC
1170 Peachtree Street
12th Floor, Suite 1200
Atlanta, GA 30309
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web:
http://www.evaristesys.com/