[SR-Users] Kamailio ims / rtpproxy

[trojak at st.fri.uniza.sk]

Hi All!

We did litttle research:
- both behind the NAT = all OK = straeming over the rtpproxy
- caller behind NAT (other public) = all BAD = no change in SDP  
(Connection Address) - rtp stream sending on private addres
- calle behind NAT (other public) = all BAD = SDP has changed but only  
private IP address... public IP unchanged = so rtpproxy do not ralay  
one way stream

Can somebody (especialy IMS) please help us

Thanks

Best regards,
Lubo

> Hi Daniel,
>
> thank you for answer. I think that parts of kamailio default config  
> will not working with pcscf. (e.g. there is on pcscf no database -  
> it has hss)
>
> It partialy works with pcscf config -> it rewrites Connecition  
> Infromation IP in SDP:
> - sometimes with IP of rtpproxy (more often when both clietnts are  
> behind NAT)
> - sometimes with public IP of NATed client (we are not sure why)
> - or unchanged (when one client is behind NAT and other is public)
>
> but this works only with Monster client, with Boghe IP is unchanged  
> (shouldn't it be client independent ?).
>
> Maybe someone from IMS help us.
>
> Thanks all for any advice.
>
> Best regards,
>
> Lubo
>
> Daniel-Constantin Mierla <miconda at gmail.com>:
>
>> Hello,
>>
>> On 1/23/12 10:43 AM, trojak at st.fri.uniza.sk wrote:
>>>
>>> Hi,
>>>
>>> I am trying to make kamailio PCSCF working with rtpproxy (for NAT  
>>> traversal).
>>> I would like to ask, if there is any tutorial for this, or if you  
>>> can give me any advice.
>> Maybe IMS guys can give other hints, what is on public so far was  
>> summarized at:
>> * http://www.kamailio.org/w/2011/01/ims-extensions-available-for-testing/
>>
>>> I also have installed rtpproxy package; #!define WITH_NAT, and  
>>> defined rtpproxy port in config file...
>>> But this is not working. I noticed, that in default config file of  
>>> pcscf is nothing in routing logic with rtpproxy (or it is  
>>> unnecessary ?), so I try to copy route[RELAY] route[NAT]  
>>> route[RTPPROXY] modules from kamailio (no pcscf) config file...  
>>> but also with no success.
>>>
>>> Can you help me please ? What I am doing wrong ? Do you have any  
>>> configuration working with rtpproxy ?
>> Be sure you can the nat handling routes for INVITES behind nat. You  
>> can follow the logic in the default config file and adapt it for  
>> you pcscf config. In summary should be like:
>> - invite comes in, test if it is from caller behind nat
>> - lookup location returns a branch flag if the calee is behind nat  
>> (you have to set that branch flag for register request coming from  
>> users)
>> - if caller or callee are behind nat, engage rtpproxy for that call  
>> and set a onreply route to update sdp for 18x/200 replies
>> - default config adds a Route header parameter for nated calls to  
>> detect easily the natted situation for re-invites or bye
>>
>> Cheers,
>> Daniel
>>
>> -- 
>> Daniel-Constantin Mierla -- http://www.asipto.com
>> http://linkedin.com/in/miconda -- http://twitter.com/miconda