Hi, I setup the presence server. My sip phone sends a PUBLISH msg. Th presence server sends a 200 msg. My another sip phone sends a SUBSCRIBE msg. The presence server returns 202 msg, and NOTIFY msg. These msgs does not include user in the contact header My sip phone sends a 200 msg I sends a second SUBSCRIBE msg to refresh it. This time my subscribe msg does not include the user in the request msg because the presence server did not include the user in the contact header. The presence server replied back with a 404 messge. So I looked at the codes, and add the user in the contact header when the presence server replys back to a client. But I stll have a same 404 msg. Do I miss something? I always appreciate your help.