[SR-Users] Kamailio ims / rtpproxy

[trojak at st.fri.uniza.sk]

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