Hi folks, I am in the process of searching for a SIP stack to a conference server project, where resiprocate, baresip, and pjsip are some of the main containers. The PJSUA2 API level seems really nice, and so I've been looking at the class structure/hierarchy for Accounts, Endpoints, etc and trying to map that to my needs. If I've understood things correctly, there is no problem for an endpoint to have multiple, independent phonecalls running? (So its not assumed that an Endpoint acts as a single SIP Terminal with X number of related calls) The main issue for me is that my customer has their own media-libraries and (partially the sdp negotiation logic) that they want me to use, and I am trying to figure out just how tricky it is to switch out that logic to the stuff the customer wants me to use. Is there anyone that can provide hints or ideas on this challenge? I get the feeling that somethings might be possible by just subclassing Endpoint and other classess and overriding a few things, but there might be other media/sdp logic that is highly integrated/tightly bound together? Any feedback highly appreciated. TQ