The sequence when registration fails after ports 16384-32768 are forwarded on the ADSL router to Freeswitch
send 628 bytes to udp/[27.111.14.67]:5060 at 19:09:41.215185:
   ------------------------------------------------------------------------
   REGISTER sip:sip.kiwilink.co.nz;transport=udp SIP/2.0
   Via: SIP/2.0/UDP 192.168.1.61;rport;branch=z9hG4bK03N4t2ptK8pZe
   Max-Forwards: 70
   From: <sip:095290110@kiwilink.co.nz>;tag=2mmX29y3DapNm
   To: <sip:095290110@kiwilink.co.nz>
   Call-ID: f6f9fb18-e3ad-41ec-9115-fc5fba6cd47e
   CSeq: 57119194 REGISTER
   Contact: <sip:gw+outbound2@192.168.1.61:5060;transport=udp;gw=outbound2>
   Expires: 180
   User-Agent: FreeSWITCH-mod_sofia/1.5.7b+git~20131111T224713Z~5456daa010~32bit
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
   Supported: timer, precondition, path, replaces
   Content-Length: 0
   
   ------------------------------------------------------------------------
recv 583 bytes from udp/[27.111.14.67]:5060 at 19:09:41.263187:
   ------------------------------------------------------------------------
   OPTIONS sip:gw+outbound2@192.168.1.61:5060;transport=udp;gw=outbound2 SIP/2.0
   Via: SIP/2.0/UDP 27.111.14.67:5060;branch=z9hG4bK78e47c68;rport
   Max-Forwards: 70
   From: "nzpbx" <sip:nzpbx@27.111.14.67>;tag=as30d40f10
   To: <sip:gw+outbound2@192.168.1.61:5060;transport=udp;gw=outbound2>
   Contact: <sip:nzpbx@27.111.14.67:5060>
   Call-ID: 70ba45102bb84a422648973c2df09f0e@27.111.14.67
   CSeq: 102 OPTIONS
   User-Agent: NZ PBX
   Date: Sat, 15 Mar 2014 19:09:41 GMT
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
   Supported: replaces
   Content-Length: 0
   
   ------------------------------------------------------------------------
send 640 bytes to udp/[27.111.14.67]:5060 at 19:09:41.263187:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 27.111.14.67:5060;branch=z9hG4bK78e47c68;rport=5060
   From: "nzpbx" <sip:nzpbx@27.111.14.67>;tag=as30d40f10
   To: <sip:gw+outbound2@192.168.1.61:5060;transport=udp;gw=outbound2>;tag=6rS09N2H2DF0j
   Call-ID: 70ba45102bb84a422648973c2df09f0e@27.111.14.67
   CSeq: 102 OPTIONS
   Contact: <sip:192.168.1.61>
   User-Agent: FreeSWITCH-mod_sofia/1.5.7b+git~20131111T224713Z~5456daa010~32bit
   Accept: application/sdp
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
   Supported: timer, precondition, path, replaces
   Allow-Events: talk, hold, conference, refer
   Content-Length: 0
   
   ------------------------------------------------------------------------
recv 510 bytes from udp/[27.111.14.67]:5060 at 19:09:41.264187:
   ------------------------------------------------------------------------
   SIP/2.0 401 Unauthorized
   Via: SIP/2.0/UDP 192.168.1.61;branch=z9hG4bK03N4t2ptK8pZe;received=192.168.1.61;rport=5061
   From: <sip:095290110@kiwilink.co.nz>;tag=2mmX29y3DapNm
   To: <sip:095290110@kiwilink.co.nz>;tag=as47d3660e
   Call-ID: f6f9fb18-e3ad-41ec-9115-fc5fba6cd47e
   CSeq: 57119194 REGISTER
   Server: NZ PBX
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
   Supported: replaces
   WWW-Authenticate: Digest algorithm=MD5, realm="voip", nonce="3bf589ea"
   Content-Length: 0
   
   ------------------------------------------------------------------------
2014-03-16 08:10:10.197842 [NOTICE] sofia_reg.c:418 Registering outbound2
2014-03-16 08:11:11.197331 [WARNING] sofia_reg.c:454 Timeout Registering outbound2
2014-03-16 08:11:12.197388 [WARNING] sofia_reg.c:473 outbound2 Failed Registration [908], setting retry to 30 seconds.