[SR-Users] Modifying SDP in Kamailio

Daniel-Constantin Mierla miconda at gmail.com
Thu May 22 10:33:29 CEST 2014


perhaps the logs of freeswitch can say more, but I am not familiar 
reading them. You can send here the ngrep output on port 5060 on 
kamailio server to see if what is sent to freeswitch is ok.


On 18/05/14 08:34, MrIhaveAnOpinionOnEverything wrote:
> Hi guys:
>     I am a R&D engineer trying to learn kamailio.  After following 
> some tutorials and reading the thread in this mailing list I was able 
> to setup a voip backend with this configuration
>    I am using Freeswitch as a media server.  After configuring RTP 
> Proxy and kamailio to use bridged mode. I was able to successfully 
> setup a voip backend like the one above.
>    I encountered a problem when the UAC I am using is a webclient like 
> sipml5.
>    I noticed that when SIP INVITES from KAMAILIO to FREESWITCH are 
> being passed when a INVITE transaction is initiated from a sipml5 
> client FREESWITCH is trying to use the public ip of webrtc server of 
> the sipml5 backend. Unfortunately, I am using private ip/LAN IP 
> between kamailio and freeswitch. As a result calls are established but 
> there is no audio that is happening.
>     I am attaching a snapshot of the ngrep that on kamailio and 
> freeswitch server for your reference.
>     I would like to know if there is a setting in kamailio that would 
> allow me to modify the IP in the "o" and "c" sdp parameter when 
> forwarding an invite to Freeswitch.
>     I did another test. XLITE ---> KAMAILIO ---> FREESWITCH ----> 
> KAMAILIO ----> sipml5 And the call works. It has audio. I think it 
> must have something to do with the SDP header that is being generated 
> by sip5ml UAC that is conflicting with my setup.
>     Any help or advice will be greatly appreciated. Thanks.
> -- 
> "When I look at you I see two people, ther person you are
> and the person you are supposed to be. Someday these two
> people will meet. And when they do, they will achieve great things"
> - Gene Hackman, The Replacements
> Catch up on me and check my BLOG at
> http://mrihaveanopiniononeverything.blogspot.com
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Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda

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