[SR-Users] Kamailio invite fails with 403 at cscf

I am using kamailio 4.4.2 IMS Registration completes successfully, but S-CSCF gives the following error when P-CSCF relays INVITE to S-CSCF: 32(1349) ERROR: ims_dialog [dlg_handlers.c:190]: populate_leg_info(): bad sip message or missing Contact hdr 32(1349) ERROR: ims_dialog [dlg_handlers.c:1352]: dlg_onreply(): could not add further info to the dlg out Resultantly, P-CSCF returns a 403 with: "Forbidden - You must register first with a S-CSCF" It appears that pcscf_is_registered("location") is unable to lookup the location although the database seems to have valid entries. Any hints on how I can get the INVITE processed without this issue? Regards, Owais