[SR-Users] Removing headers in a failure route on 3xx redirect

[Daniel-Constantin Mierla]

Hello,

if you want to have different headers for each destination you attempt
to route to, use a branch_route where you add the headers. What is added
in request_route before creating the transaction is going to be common
for all outgoing branches.

Cheers,
Daniel

On 09/07/15 17:11, Daniel Tryba wrote:
> I'm adding and removing headers in the standard route[RELAY], but if there is 
> a redirection involved headers aren't removed.
>
> route[RELAY]
> {
> #stdstuff
>         route(ADDCHECKSUM);
>
>         # enable additional event routes for forwarded requests
>         # - serial forking, RTP relaying handling, a.s.o.
>         if (is_method("INVITE|SUBSCRIBE")) {
>                 t_on_branch("MANAGE_BRANCH");
>                 t_on_reply("MANAGE_REPLY");
>         }
>         if (is_method("INVITE")) {
>                 t_on_failure("MANAGE_FAILURE");
>         }
>
>         if (!t_relay()) {
>                 sl_reply_error();
>         }
>         exit;
> }
>
> route[ADDCHECKSUM]
> {
>         if($avp(dst_accountcode) || $avp(src_accountcode))
>         {
>                 #some magic
>                 remove_hf("X-rand");
>                 remove_hf("X-csum");
>
>                 append_hf("X-rand: $var(rand)\r\n");
>                 append_hf("X-csum: $var(checksum)\r\n");
>         }
>
>         return;
> }
>
> This works well unless the destination is a redirecting sip server.
>
> failure_route[MANAGE_FAILURE] {
>         route(NATMANAGE);
>
>         if (t_is_canceled()) {
>                 exit;
>         }
>
>         if (t_check_status("3[0-9][0-9]"))
>         {
> #...
>                 route(RELAY);
>                 exit;
>         }
>
>
> -user calls destination.
> -dispatcher sets destination is send to redirectserver and routes to RELAY, 
> addchecksums add some headers called from relay.
> -redirectserver replies 302.
> -failure route triggers and ends with a route to RELAY. Any existing old 
> values should be removed and the newer ones added.
>
> But end the result is that I have two sets op X-rand/csum headers for the 
> INVITE to the redirection contact. How do I get rid of every X-csum/rand 
> header except the last added ones?
>
> Version tested: 4.2.5.
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Book: SIP Routing With Kamailio - http://www.asipto.com