Hi, I have a suggestion for a new feature of PJSIP (PJLIB) headers. Sometimes it would be nice to know the version of PJSIP during compile-time. Something like: #if defined(PJ_VERSION) && (PJ_VERSION >= 0x010805) /* Code for version 1.8.5 and later */ #else /* Code for older versions */ #endif Or: #if defined(PJ_VERSION_MAJOR) && (PJ_VERSION_MAJOR >= 2) /* ... */ #endif PJSIP has an excellent backwards compatibility for simple applications, but to be able to support more versions of PJSIP library in your application, this would be very useful. Cheers, - Vali