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

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.-