Iñaki Baz Castillo wrote:
El Miércoles, 4 de Marzo de 2009, alexander merkulov escribió:
thats work for invite nice, but not work fro cancel even this (very simple form) not change cancel
if (method == "BYE" || method == "CANCEL") {# xlog("bye\n");a xlog("L_INFO", "CANCEL - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); if(t_check_trans()){ xlog("triing to rewrite"); if ( subst('/192/aaa/ig') ) {}; t_relay(); exit; }else{ xlog("no trans"); exit; }
CANCEL is hop-by-hop. This means that when a proxy receives a CANCEL it *doesn't* forward it. Instead it "eats" that CANCEL and *generates* a new one. This is how SIP defines the behaviour of a CANCEL.
But again I ask you, why do you need rewritting the To header? It shouldn't be required, neither in a CANCEL. In fact when a UAS receives a CANCEL it just should inspect the Via "branch" parameter to match it against a current INVITE server transaction.
Looking at the change he is attempting to make, it appears that he is trying to force Kamailio to act more like an SBC doing NAT transversal through a B2BUA scenario, than a proxy.
Tim