Hello everyone, I am new to this forum. I recently installed the free version of the 3CX software and it runs well. However, I have a challenge using it with my nokia e51 phone (it has voip capabilities). I cannot use the phone to make calls but i receive calls on it. I followed the configuration details given on the 3cx website (http://www.3cx.com/sip-phones/nokia-e65.html). Interestingly, the same settings works on another phone without any problems. When i try making calls from my phone, the phone reports "Address not in use" and the server reports "20:25:01.046 AuthMgr:nAuthFailure [CM102001]: Authentication failed for SipReq: INVITE firstname.lastname@example.org tid=iisnk7qqvtqfn57avf4s3i3 cseq=INVITE email@example.com / 559 from(wire); Reason: Credentials don't match, check that authorization-ID and password match the ones in extension settings " What settings do i need to tweak on my phone so i can make calls from it? thanks.