Hi Benny, I made some change on ua.cpp, now E61 can register to Sipx now. I am using Sipx as sip server. However, when I try to call E61, I can see sip message popup, but I can't receive call. I have pressed A to answer calls. I can't make call to certain extension either. The audio loop is working fine, I can hear myself. Any hints would be really appreciate ! Thanks a lot! Sen