Gummadidala, Ravi writes: ser can be "programmed" via ser.cfg file to add or drop any headers you like. if i remember correctly, currently there is no parsing of any p headers, but there is parsing of remote-party-id header, which can also be used to implement network asserted identity. i guess you would need to add parsing of P-Preferred-Identity header and then modify proxy_authorize function so that it can authenticate request based on P-Preferred-Identity header instead of from header. maybe the most flexible solution would be to authenticate based on an AVP, which can before authentication loaded with uri from whatever header. -- juha