[SR-Users] Remove/Append headers in 200 canceling and 200 ok to BYE

Hi List, I'm trying to add and remove some headers in 200 canceling and 200 ok to BYEs with no success. I don't know in which route to add my remove_hf and append_hf. It seems that I can't catch it on reply either on request route. I tried adding it in event_route[tm:local-response] { xlog("L_ERR", "TM LOCAL REPONSE!"); route(MANAGE_HEADERS); } This is my route to manage hdrs: route[MANAGE_HEADERS]{ xlog("L_ERR", "MANAGE HDRS !"); keep_hf("TH"); # for topoh append("AHDR1:asdf\r\n"); return; } I suppose SERVER HDR should be removed but: U 2017/01/12 12:45:41.566733 172.16.213.38:5060 -> 172.16.50.41:5060 SIP/2.0 200 canceling. Via: SIP/2.0/UDP 172.16.50.41:5060;branch=z9hG4bKgg8ekd3080braugkm700.1. CSeq: 102 CANCEL. From: <sip:xx@172.16.50.41>;tag=SD7b10b01-as5ba5e269. To: <sip:xxx@172.16.213.38>;tag=4a86e96addfb27a943bc86e1872032b6-0a8b. Call-ID: SD7b10b01-6a7d1089793bda79481f25cf88c023ed-c540dl1. Server: kamailio (4.4.4 (x86_64/linux)). Content-Length: 0. Any help will be very appreciated. Thanks in advance! Diego