I am using P J Sip of pjproject-1.2, in linux. I have a need to modify / add to the core SIP header fields, like To, From and Contact. Here is an example: This is the current contact message that PJSIP INVITE creates (for outgoing INVITE): Contact: <sip:858*610*10000 at 10.8.39.34:5060> I need to change this to something like this: Contact: <sip:858*610*10000 at 10.8.39.34:5060>;cache;range="23,24,25,26" Modifying the "local Contact" argument of pjsip_dlg_create_uac, and passing it "<sip:858*610*10000 at 10.8.39.34:5060>;cache;range="23,24,25,26"" causes a failure of pjsip_dlg_create_uac. Any ideas how to do this? Bala -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090617/fb4afa4d/attachment.html>