As long as the media endpoint on the "Sip_TRUNK" side has direct network and transport-layer reachability to the Freeswitch, there should be no need for an intervening rtpproxy, and in fact, life would be much simpler without it.

This would require both the service provider side and the Freeswitch to have public IP addresses with no firewall rules in between that would prevent the free flow of RTP between them across a broad range of UDP ports. If one or both endpoints are behind NAT and/or on a private network, you're going to need an rtpproxy between them.

-- Alex

--
Alex Balashov | Principal | Evariste Systems LLC
1447 Peachtree Street NE, Suite 700
Atlanta, GA 30309
United States

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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