[Serusers] Problem : Can SER process the reINVITE messages properly?

[Ricardo Martinez]

Hello.
I'm having problems trying to make SER,  NAT'd endpoints and reINVITE work
together.
I was using the "gw-pstn3.07.cfg" file from onsip.org to do some tests, and
this is what i have. In one side i have an Asterisk with an endpoint
registered in it (let's call it A). In the other side i have a PAP2 under
NAT (let's call it B). 


A ---------- Asterisk ----------- SER ----------- B (NAT'd)
200.0.0.7	200.0.0.6	       200.0.0.5
10.0.0.4

When i make a call from "A" to "B" this is what i see (in terms of SDP).
Looking from SER.

A --------- Asterisk ------------ SER ------------ B (NAT'd)
							    Public:
200.0.0.4
200.0.0.7       200.0.0.6                   200.0.0.5	    	    Inside:
10.0.0.1

		     INVITE
	        c:200.0.0.6:19996
                      ------------------->
					     INVITE	
					c:200.0.0.5:35010 
				 	---------------->


Caller                Via                   Called     Status    Duration
Codec    Type   Traffic
--------------------------------------------------------------------------
200.0.0.6:19996 - 200.0.0.5:35010 - ?.?.?.?:?  inactive     0'04"  Unknown
Audio  0/0/0  

Total traffic:  0bps/0bps/0bps (in1/in2/out)
Session count:  1

So far is ok..........and the phone is answered
						OK	
					c:10.0.0.1:16440 
					<----------------    (the phone is
answered)
			OK
		 c:200.0.0.5:35010
                   <---------------------

		     reINVITE
	        c:200.0.0.7:19996
                   --------------------->
					     reINVITE	
					c:200.0.0.7:19996 
				 	---------------->

						OK	
					c:10.0.0.1:16440
					<----------------
			OK
		 c:10.0.0.1:16440
                   <---------------------

Finally according to the "session" information : 

Caller                               Via                   Called
Status    Duration  Codec  Type   Traffic        
----------------------------------------------------------------------------
----------
200.0.0.6:19996 - 200.0.0.5:35010 - 200.0.0.7:16420  inactive     0'26"
G729   Audio  0/11.48k/11.48k

Total traffic:  0bps/0bps/0bps (in1/in2/out)
Session count:  1
And the audio is only in one way. :(

So. you can see the reINVITE message apparently is not being processed as a
call to a NAT'd endpoint and therefore is not using the mediaproxy, you can
see the second "OK" messsage has the invalid IP from the NAT'd user is in
his sdp information. 
As i said it before i am using the gw-pstn configuration file from the
onsip.org and as far as i can remember this configuration can handle the
reINVITE? isn't
I'm also using the last version of the mediaproxy (1.3.1).
Can someone tell me what i'm doing wrong?

Hope someone could help me here.
Thanks in advance.
Regards...

Ricardo Martinez.-