Hi! I am trying to develop an IAX sophone for Android. By now I am doing some tests using libraries with java implementations of the iax2 protocol. The thing is that when I try to register an IAX2 extension with my elasti I get no success. I've tried differents softphones and the only one who can register is Zoiper, with others (voixphone, yate, ...) I always get an REGREJ from the server (the same answer that I get with the java libraries). Does anyone Know why I only can register with Zoiper? how can resolve this problem? Thanks a lot!