I'm following tutorial at http://wiki.freeswitch.org/wiki/Enterprise_deployment_OpenSIPS and opensips is not forwarding the registration requests...
Running opensips-1.6.4-2-tls, 
Here is what the debugging looks like when i try to register with the opensip box
10.20.30.17 is the opensips box.
10.20.30.18 is the FreeSWITCH box.


Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_msg: SIP Request: 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_msg:  method:  <REGISTER> 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_msg:  uri:     <sip:10.20.30.17> 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_msg:  version: <SIP/2.0> 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_headers: flags=2 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:get_hdr_field: cseq <CSeq>: <43> <REGISTER> 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_via_param: found param type 232, <branch> = <z9hG4bKda029da0-e604-1910-80bc-002622a67db9>; state=6 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_via_param: found param type 235, <rport> = <n/a>; state=17 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_via: end of header reached, state=5 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_headers: via found, flags=2 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_headers: this is the first via 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:receive_msg: After parse_msg... 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:receive_msg: preparing to run routing scripts... 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_headers: flags=100 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_to: end of header reached, state=10 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_to: display={}, ruri={sip:1000@10.20.30.17} 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:get_hdr_field: <To> [24]; uri=[sip:1000@10.20.30.17]  
 ]  16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:get_hdr_field: to body [<sip:1000@10.20.30.17>
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:get_hdr_field: content_length=0 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:maxfwd:is_maxfwd_present: value = 70  
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:uri:has_totag: no totag 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_to_param: tag=70ea9ca0-e604-1910-80bc-002622a67db9 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_to: end of header reached, state=29 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_to: display={}, ruri={sip:1000@10.20.30.17} 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:dispatcher:ds_select_dst: set [1] 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:dispatcher:ds_select_dst: alg hash [1], id [1] 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:parse_headers: flags=ffffffffffffffff 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:get_hdr_field: found end of header 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:check_ip_address: params 72.237.213.162, 72.237.213.162, 0 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:destroy_avp_list: destroying list (nil) 
Aug 16 13:40:14 voipdev1 /usr/local/sbin/opensips[2580]: DBG:core:receive_msg: cleaning up