Module: kamailio
Branch: master
Commit: b4e11cb25d848651406e0ad355d54f10db971761
URL: 
https://github.com/kamailio/kamailio/commit/b4e11cb25d848651406e0ad355d54f10db971761

Author: Daniel-Constantin Mierla <mico...@gmail.com>
Committer: Daniel-Constantin Mierla <mico...@gmail.com>
Date: 2019-07-29T13:51:57+02:00

core: skip to-tag when computing via branch for invite, ack and cancel

- proper functionality for stateless proxy in case of negative ACK (in
this case the INVITE has no To-tag, but ACK has it and resulted in
different via branch, making downstream proxy to not match transaction)

---

Modified: src/core/char_msg_val.h

---

Diff:  
https://github.com/kamailio/kamailio/commit/b4e11cb25d848651406e0ad355d54f10db971761.diff
Patch: 
https://github.com/kamailio/kamailio/commit/b4e11cb25d848651406e0ad355d54f10db971761.patch

---

diff --git a/src/core/char_msg_val.h b/src/core/char_msg_val.h
index 79461cd836..436f58b401 100644
--- a/src/core/char_msg_val.h
+++ b/src/core/char_msg_val.h
@@ -38,6 +38,7 @@
 inline static int char_msg_val( struct sip_msg *msg, char *cv )
 {
        str src[8];
+       str sempty = str_init("");
 
        if (unlikely(!check_transaction_quadruple(msg))) {
                LM_ERR("can't calculate char_value due to a parsing error\n");
@@ -55,7 +56,12 @@ inline static int char_msg_val( struct sip_msg *msg, char 
*cv )
        }
        /* use only the from & to tags */
        src[0]=get_from(msg)->tag_value;
-       src[1]=get_to(msg)->tag_value;
+       if(msg->first_line.u.request.method_value
+                       & (METHOD_INVITE|METHOD_ACK|METHOD_CANCEL)) {
+               src[1]=sempty;
+       } else {
+               src[1]=get_to(msg)->tag_value;
+       }
        src[2]= msg->callid->body;
        src[3]= msg->first_line.u.request.uri;
        src[4]= get_cseq( msg )->number;


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