[Serusers] how to catch in-dialog INVITEs to NATed user?

[Maxim Sobolev]

Klaus Darilion wrote:

> Hi!
> 
> I just came along a problem in the following scenario: user with public 
> IP calls a NATed user. The first INVITE causes a lookup("location") 
> which also sets the natflag (usually flag 6).
> 
> Then I check if flag 6 is set and will force the RTP proxy if it is set. 
>  If the public client sends an in-dialog reINVITE, the reINVITE is 
> processed by the loose_route block and there is no lookup("location") 
> for those request. So, how can I find out that the request will be 
> forwarded to a NATed user (to force the RTP proxy)?

You can use "forced lookup" feature available in newest versions of 
nathelper/rtppoxy. When force_rtp_prpxy is called with the `l' flag, it 
only rewrites SDP and causes the session go through RTP proxy if session 
with such id already exists in the proxy.

-Maxim