Changeset 2799 for pjproject

Timestamp:

Jun 25, 2009 10:58:13 AM (15 years ago)

Author:

bennylp

Message:

Ticket #797: Behavior when cancelling INVITE before provisional response is received

• backported from ticket #506

Location:

pjproject/branches/1.0/pjsip

Files:

• include/pjsip-ua/sip_inv.h (modified) (1 diff)
• src/pjsip-ua/sip_inv.c (modified) (1 diff)

pjproject/branches/1.0/pjsip/include/pjsip-ua/sip_inv.h

@@ -654 +654 @@
  * Create a SIP message to initiate invite session termination. Depending on 
  * the state of the session, this function may return CANCEL request, 
- * a non-2xx final response, or a BYE request. If the session has not answered
- * the incoming INVITE, this function creates the non-2xx final response with 
- * the specified status code in st_code and optional status text in st_text.
+ * a non-2xx final response, a BYE request, or even no request. 
+ *
+ * For UAS, if the session has not answered the incoming INVITE, this function
+ * creates the non-2xx final response with the specified status code in 
+ * \a st_code and optional status text in \a st_text. 
+ *
+ * For UAC, if the original INVITE has not been answered with a final 
+ * response, the behavior depends on whether provisional response has been
+ * received. If provisional response has been received, this function will
+ * create CANCEL request. If no provisional response has been received, the
+ * function will not create CANCEL request (the function will return 
+ * PJ_SUCCESS but the \a p_tdata will contain NULL) because we cannot send
+ * CANCEL before receiving provisional response. If then a provisional
+ * response is received, the invite session will send CANCEL automatically.
+ * 
+ * For both UAC and UAS, if the INVITE session has been answered with final
+ * response, a BYE request will be created.
  *
  * @param inv           The invite session.
  * @param st_code       Status code to be used for terminating the session.
  * @param st_text       Optional status text.
- * @param p_tdata       Pointer to receive the message to be created.
- *
- * @return              PJ_SUCCESS if termination message can be created.
+ * @param p_tdata       Pointer to receive the message to be created. Note
+ *                      that it's possible to receive NULL here while the
+ *                      function returns PJ_SUCCESS, see the description.
+ *
+ * @return              PJ_SUCCESS if termination is initiated.
  */
 PJ_DECL(pj_status_t) pjsip_inv_end_session( pjsip_inv_session *inv,

pjproject/branches/1.0/pjsip/src/pjsip-ua/sip_inv.c

@@ -1868 +1868 @@
             if (inv->invite_tsx->status_code < 100) {
 
-                pjsip_tsx_stop_retransmit(inv->invite_tsx);
+                /* Do not stop INVITE retransmission, see ticket #506 */
+                //pjsip_tsx_stop_retransmit(inv->invite_tsx);
                 inv->cancelling = PJ_TRUE;
                 inv->pending_cancel = PJ_TRUE;
                 *p_tdata = NULL;
-                PJ_LOG(4, (inv->obj_name, "Stopping retransmission, "
-                           "delaying CANCEL"));
+                PJ_LOG(4, (inv->obj_name, "Delaying CANCEL since no "
+                           "provisional response is received yet"));
                 return PJ_SUCCESS;
             }