Hello all, I am trying to setup a local SIP connection between two computers on my network but no matter what I do I always seem to get something along the lines of the following: ' 19:00:03.864 pjsua_app.c Call 1 state changed to CALLING >>> 19:00:03.883 pjsua_app.c Call 1 is DISCONNECTED [reason=500 (Internal Server Error)] 19:00:03.883 pjsua_app.c [DISCONNCTD] To: sip:10.1.200.40 Call time: 00h:00m:00s, 1st res in 19 ms, conn in 0ms SRTP status: Not active Crypto-suite: (null) I have tried with with different combinations of URL as follows: sip:<ip>:<port> sip:<ip> sip:<localuser>@<ip>... etc... But I always seem to get the same error. Can anyone provide some advice on this issue? Many thanks in advance, Steven