Hi fulks I try changing info value in PAI header-field by using subst() function into route block as below: route[3] { ... $var(fromU) = 22227777; ... subst('/^P-Asserted-Identity:(.*)sip:[^@]*@([a-zA-Z0-9.:]+)(.*)$/P-Asserted-Identity:\1sip:$var(fromU)@\2\3/ig'); ... ... forward(); exit; } But when I read ngrep command output I catch P-Asserted-Identity header as below: +++++++++++++++++++++++++++++++++++++++++++++++ before route[3] processing: INVITE sip:99992222@15.113.132.21:5060 <http://sip:99992222@15.113.132.21:5060> SIP/2.0. ... P-Asserted-Identity: "Display Name 7777" <sip:7777@101.14.101.245 <mailto:sip%3A7777@101.14.101.245>>. ... +++++++++++++++++++++++++++++++++++++++++++++++ after route[3] processing: INVITE sip:99992222@15.113.132.21:5060 <http://sip:99992222@15.113.132.21:5060> SIP/2.0. ... P-Asserted-Identity: "Display Name 7777" <sip:22227777@101.14.101.245 <mailto:sip%3A22227777@101.14.101.245>>.P-Asserted-Identity: "Display Name 7777" <sip:7777@101.14.101.245 <mailto:sip%3A7777@101.14.101.245>>. ... +++++++++++++++++++++++++++++++++++++++++++++++ So, is it normal or bug behaviors? Regards CMA _______________________________________________ Kamailio (SER) - Development Mailing List sr-dev(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev