Heya Joy, I tried OpenSER 1.3 4 months ago in a 64-bit architecture and i had too many problems during compilation, or when ok, it crashes often. I'd to turn back my project to SER (sorry Daniel ;), I didn't have time to debug. Then, Kamailio project appeared, and I use it in a 64-bit architecture now, I didn't have any problems (compilation, ...). All is fine, it works perfectly. Maybe, just try it ? .Sam.