Hello, On 07/03/16 16:29, jaflong jaflong wrote: I think you should use here rtpproxy or rtpengine, if you need to relay the rtp. If you need the random port for other reasons, perhaps you can use the embedded interpreters or exec module to discover what ports are available. However, if you don't block it, another application can use it in between your discovery and the moment you want to use it. Cheers, Daniel -- Daniel-Constantin Mierla http://www.asipto.com http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda Kamailio World Conference, Berlin, May 18-20, 2016 - http://www.kamailioworld.com