Alex Currently there is no way to identify a particular call and filter with PTRACE. Most people use WireShark http://www.wireshark.org/ to intercept the messages on the wire, it has a fantastic PER decoder and call filter/trace functionally. Simon From: h323plus-bounces@lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Alex Katebi Sent: Friday, August 27, 2010 3:43 AM To: h323plus@lists.packetizer.com Subject: [h323plus] Call Tracing && XER ??? Hello, I need trace calls for debugging. What are the options available for doing this? I know how to get PTRACE but I need something that is specific to a call. I was wondering that if I can get XER encoding and then filter for a call. Anyone can tell me how to get XER encoding for the OpenH323? Thanks, Alex