The ports assigned in that sdp are for the session that sends it only… you can't just re-use them on a different invite.  Can you try to explain a bit more what you are trying to accomplish?  

Mike

On Aug 19, 2013, at 6:03 PM, Danny Gershman <dannygershman@cinchcast.com> wrote:

So I have an INVITE that comes in that doesn’t have SDP in it. I have the “enable-3pcc” turned on so FreeSWITCH does respond properly. So then it responds with SDP allocating an endpoint. Then I take that SDP information and I turn around and send a new INVITE with the SDP in it. The hopes is that this endpoint is then bridges to a new endpoint. Essentially Freeswitch is connected to itself.

Here is the pastebin - http://pastebin.freeswitch.org/21327

Look at the CreatePlayConnectionForConference:1 in the User-Agent field.  And then look at the CreatePlayConnectionForConference:2.  Those two are supposed be linked together with RTP.

Danny Gershman