struct tp_adapter *adapter = (struct tp_adapter*)tp;
   ...

Hi, I need to add RTP header extension and I guess I have to create a new transport adapter to do this. I'm currently using pjsua2 API. Reading the documentation, I copied the transport_adapter_sample first but I don't succeed to make it work: the callbacks in the pjmedia_transport op parameter are always NULL. But as far as I understand the source code, it seems logical because in each callback we try to bind 2 different structures tp_adapter and pjmedia_transport, for example: static pj_status_t transport_destroy (pjmedia_transport *tp) { struct tp_adapter *adapter = (struct tp_adapter*)tp; ... } So I don't understand how the sample can work! Could anybody explain to me the logical of the example? did anyone already tried to create a news transport adaptor in pjsua2? Thanks for your help Thibault