Changeset 980 for pjproject/branches/pjproject-0.5-stable/pjsip/src/pjsip/sip_dialog.c

Timestamp:

Feb 19, 2007 6:37:42 PM (17 years ago)

Author:

bennylp

Message:

Fixed ticket #111 on stable branch: workaround for forked dialog

File:

• pjproject/branches/pjproject-0.5-stable/pjsip/src/pjsip/sip_dialog.c (modified) (2 diffs)

pjproject/branches/pjproject-0.5-stable/pjsip/src/pjsip/sip_dialog.c

@@ -1519 +1519 @@
     /* When we receive response that establishes dialog, update To tag, 
      * route set and dialog target.
-     */
-    if (dlg->state == PJSIP_DIALOG_STATE_NULL && 
-        pjsip_method_creates_dialog(&rdata->msg_info.cseq->method) &&
-        (res_code > 100 && res_code < 300) &&
-        rdata->msg_info.to->tag.slen)
+     * 
+     * The second condition of the "if" is a workaround for forking. 
+     * Originally, the dialog takes the first To tag seen and set it as 
+     * the remote tag. If the tag in 2xx response is different than this 
+     * tag, ACK will be sent with wrong To tag and incoming request with 
+     * this tag will be rejected with 481. 
+     * 
+     * The workaround for this is to take the To tag received in the 
+     * 2xx response and set it as remote tag. 
+     */ 
+    if ((dlg->state == PJSIP_DIALOG_STATE_NULL &&  
+         pjsip_method_creates_dialog(&rdata->msg_info.cseq->method) && 
+         (res_code > 100 && res_code < 300) && 
+         rdata->msg_info.to->tag.slen)  
+        || 
+        (dlg->role==PJSIP_ROLE_UAC && 
+         !dlg->uac_has_2xx && 
+         res_code/100 == 2 && 
+         pjsip_method_creates_dialog(&rdata->msg_info.cseq->method) && 
+         pj_strcmp(&dlg->remote.info->tag, &rdata->msg_info.to->tag)))
     {
         pjsip_hdr *hdr, *end_hdr;
@@ -1564 +1579 @@
 
         dlg->state = PJSIP_DIALOG_STATE_ESTABLISHED;
+
+ 
+        /* Prevent dialog from being updated just in case more 2xx 
+         * gets through this dialog (it shouldn't happen). 
+         */ 
+        if (dlg->role==PJSIP_ROLE_UAC && !dlg->uac_has_2xx &&  
+            res_code/100==2)  
+        { 
+            dlg->uac_has_2xx = PJ_TRUE; 
+        } 
     }