<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif; "><div>I have a client, that have an IVR that is connected via a SIP trunk.</div><div>If the IVR transfers the call back into the system using a REFER HEADER the IVR will get a 404 not found error.</div><div><br></div><div>I have setup a sip profile that allows SIP header changes but it will still fail. Can anyone give me a pointer where to look for this.</div><div>I know how to do it on an IOS device, but not on a callmanager.</div></body></html>