Hi Pedro, On Thu, Jun 19, 2008 at 3:54 PM, Pedro Gon?alves <pedro.pandre at gmail.com> wrote: > Hi all > > According to Benny, these are the procedures needed to uce ICE in a call: > > - Initially call pjmedia_ice_create() with the appropriate > pj_ice_strans_cfg. The initialization will complete asynchronously and > the ICE media transport callback will be called when initialization > completes (STUN mapping is found, TURN allocation is done, etc.). > > - When creating an offer, call pjmedia_transport_media_create() with > local SDP (and NULL as rem_sdp). The ICE media transport will add the > relevant ICE attributes in the local SDP. Then give the local SDP to > the invite session. > > - When creating an answer, also call pjmedia_transport_media_create(), > but this time give both local and remote SDP to it. The ICE media > transport will once again modify the local SDP and add ICE attributes > to local SDP, if ICE attributes are indeed found in remote offer. If > not, then it won't add ICE attributes, and ICE will not get activated. > The part to create offer/answer has changed now, and one should use pjmedia_transport_encode_sdp() instead. Please see this for more information: http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__TRANSPORT.htm#creat_oa > - When you have both local and remote SDP, and when media is okay to > be created, call pjmedia_transport_media_start(), once again giving it > both local and remote SDP. ICE negotiation will start now and ICE > media transport callback will be called when ICE negotiation > completes. > > > So far, I've been able to perform the following actions: > -When a call is to be started (in caller), I use *pjmedia_ice_create()* > and *pjmedia_transport_media_create()*. [INVITE is sent to callee with > caller's candidates] > -When answering the call, in callee I also use *pjmedia_ice_create()* > and *pjmedia_transport_media_create()* [INVITE 200 OK is is sent to > caller with callee's candidates] These have now been changed, please see above. > -The callee then uses *pjmedia_transport_media_start()* [STUN > connectivity checks start] > > I understand that now I must receive the 200 OK in the caller and also > call *pjmedia_transport_media_start()*, in order for the ICE connectivy > checks be made in both directions. > Yes. > However, how will the subsequent offer and answer be exchanged? It's the same, use pjmedia_transport_encode_sdp() to encode subsequent SDP offer or answer. > I realize that I must do something, because at the moment, when the > caller receives the INVITE 200 OK it sends an ACK, making the call to > start with the default IP addresses/Ports (the ones in lines c= and m=). > What do I have to do in order for the subsequent offer / answer be > exchanged? > The doc above should provide some info on how this can be done. You can also look at PJSUA-LIB source, the relevant files will be pjsua_call.c and pjsua_media.c. Cheers Benny > Cheers > Pedro Gon?alves > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org >
