[Serusers] 200 OK/SDP and ACK/SDP problem - 2

[Greger Viken Teigre]

Alexandr,
The best way to do this is to record nating in a record-route param. See the Getting Started configs for 0.9.x and  (I think) any example config for 2.0, see 
etc/ dir for ser-oob.cfg or the etc/buildsystem
g-)

------- Original message -------
From: Alexandr Volkov <avolkov at abisoft.spb.ru>
Sent: 22.10.'07,  10:41

> Hi all
> I have a problem that correlates with problem that was already posted in 2006-Feb (http://lists.iptel.org/pipermail/serusers/2006-February/026841.html) 
>  
> I have a stateful ser with mediaproxy at public IP, client A(SIP B2BUA) with public address and client B(user phone) with private address.
> 1. SIP dialog already established and client A send re-invite without SDP (reinvite is necessary, problem was described in rfc3725.txt).
> 2. client B respond OK(200) with NATed SDP
> 3. Client A send ACK with normal SDP.
>  
> At step 2 in ser we can determine that we need to use media proxy and we start it.
> But when we processing ACK, we see normal SDP, and won't to start mediaproxy. Thus we have one-way audio.
> I tried to use flags, but it seems that when ACK arrives all flags zeroed. (Ser imply that ACK don't belong to invite transaction?)
> I can't use AVP because commands are unavailable in onreply_route. The only way I found is to use global flags.
> But this way is worse because foreign ACK can be processed between our OK and ACK from the same transaction...
>  
> Thanks for your advise.
> Alex
>