[Freeswitch-users] How to enforce freeswitch replying to the source port instead of to the one specified in v/m header parametes (Symmetric NAT)

[Michael Jerris]

This is what force-rport is supposed to do.  That being said, I can't  
tell from your trace where it is actually going to, just what it says  
in the packet, which can be different.

Mike

On Oct 19, 2009, at 3:23 AM, Tzury Bar Yochay wrote:

> Hi,
>
> I am struggling with a cellular operator which removes the rport from
> the SIP messages sent by  the client.
> During the troubleshooting process I have been playing with the NDLB
> parameters I found mentioned at the fs-wiki
>
> <param name="NDLB-force-rport" value="true"/>
> <param name="NDLB-received-in-nat-reg-contact" value="true"/>
>
> as well as with sip-force-contact at the extension xml config file.
>
> <variables>
>    <variable name="sip-force-contact" value="NDLB-connectile- 
> dysfunction"/>
> </variables>
>
> I Want to make freeswitch replying to the source port instead of the
> port supplied by the client, that is
> to port 12543 instead of to the 7608 as you can see below some pcap
> dumps of the case.
>
> I am not sure if that would solve thep roblem and am open to other
> suggestions as well.
>
> Thanks in advance,
> Tzury
>
> pcap dumps below:
>
> ### REGISTER ###
> User Datagram Protocol, Src Port: 12543 (12543), Dst Port: sip (5060)
> REGISTER sip:example.net SIP/2.0
> v: SIP/2.0/UDP  
> 212.154.128.222:7608;branch=z9hG4bKPj41fa0abd044c35c75598d561b2f93167
> Max-Forwards: 70
> f: <sip:1013 at example.net>;tag=9194adecbf8e8179530eb589e83631db
> t: <sip:1013 at example.net>
> i: ebf2e3c254517938f90f33d8fd89326d
> CSeq: 17355 REGISTER
> m: <sip:1013 at 212.154.128.222:7608>
> Expires: 300
> l:  0
>
> ### 401 UNAUTHORIZED ###
> SIP/2.0 401 Unauthorized
> Via: SIP/2.0/UDP
> 212.154.128.222:7608;branch=z9hG4bKPj41fa0abd044c35c75598d561b2f93167
> From: <sip:1013 at example.net>;tag=9194adecbf8e8179530eb589e83631db
> To: <sip:1013 at example.net>;tag=166HraN0B149g
> Call-ID: ebf2e3c254517938f90f33d8fd89326d
> CSeq: 17355 REGISTER
> User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
> Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE,
> NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
> Supported: timer, precondition, path, replaces
> WWW-Authenticate: Digest realm="example.net",
> nonce="f2f1370c-bc7c-11de-b000-fbe81e221ab4", algorithm=MD5,
> qop="auth"
> Content-Length: 0