[Users] Question about forking

Hi, I have SIP UA's register to my OpenSER server and they can call each other. This has been working for some time now without any real issues and I'm very happy. Now I want to be able to have 1 destination be available on 2 SIP UA's. What I think the best way to do is the following: - create two accounts - make the detination point to one UA A and create an "alias" for the destination at UA B (for instance by prefixing A) - On an incoming call detect that there is the possibility to reach the destination at A and B - Fork the incoming call to A and B so that when one arm of the fork accepts the call (by going to ringing, or immediately answering, etc). My questions are: - How do I check if I can start a fork? - How do I fork and have both arms follow the logic I am currently using? -- Andreas Sikkema