hi

this is sip trace in FS server.

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From: Michael Jerris <mike@jerris.com>
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Sent: Monday, September 9, 2013 7:14 PM
Subject: Re: [Freeswitch-users] NAT issue with SBC

have you looked at a Sip trace from both sides?  Is the ACK getting to asterisk?  Is it not accepting it for some reason?