Hi Benny, I'm trying to realize a mediaproxy by using the libraries. I've followed the hints in http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__TRANSPORT__H.htm So, for every call that comes from UACs (ex. for the invite from UAC1 and the response from UAC2) I've - created an UDP transport by pjmedia_transport_udp_create() - created a media stream by pjmedia_stream_create() - then started a media thread - started the stream It goes almost well, but it's not enough 'cause in that way I receive only RTP packet from UACs to mediaproxy.. So, I have to establish in some way the streaming from mediaproxy to the UACs involved in the call. I think I'm missing something... Do you have any precious suggestions? Thanks in advance Giusy