From e624bbc74a4fe5f21f1f7175297056357cac8971 Mon Sep 17 00:00:00 2001
From: Benny Prijono <bennylp@teluu.com>
Date: Wed, 3 Jun 2009 10:19:44 +0000
Subject: Ticket #822: Retransmit provisional response every 1 minute

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@2739 74dad513-b988-da41-8d7b-12977e46ad98
---
 pjsip/src/pjsip/sip_transaction.c | 65 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 60 insertions(+), 5 deletions(-)

diff --git a/pjsip/src/pjsip/sip_transaction.c b/pjsip/src/pjsip/sip_transaction.c
index f205ff5d..4ab94632 100644
--- a/pjsip/src/pjsip/sip_transaction.c
+++ b/pjsip/src/pjsip/sip_transaction.c
@@ -146,6 +146,13 @@ static pj_time_val timeout_timer_val = { (64*PJSIP_T1_TIMEOUT)/1000,
 #define TIMER_INACTIVE	0
 #define TIMER_ACTIVE	1
 
+/* Delay for 1xx retransmission (should be 60 seconds).
+ * Specify 0 to disable this feature
+ */
+#ifndef PJSIP_TSX_1XX_RETRANS_DELAY
+#   define PJSIP_TSX_1XX_RETRANS_DELAY    60
+#endif
+
 
 /* Prototypes. */
 static void	   lock_tsx(pjsip_transaction *tsx, struct tsx_lock_data *lck);
@@ -1949,7 +1956,7 @@ PJ_DEF(pj_status_t) pjsip_tsx_retransmit_no_state(pjsip_transaction *tsx,
 static void tsx_resched_retransmission( pjsip_transaction *tsx )
 {
     pj_time_val timeout;
-    unsigned msec_time;
+    pj_uint32_t msec_time;
 
     pj_assert((tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) == 0);
 
@@ -1967,10 +1974,18 @@ static void tsx_resched_retransmission( pjsip_transaction *tsx )
 	    msec_time = pjsip_cfg()->tsx.t2;
 	}
     } else {
-	/* Retransmission of INVITE final response also caps-off at T2 */
-	pj_assert(tsx->status_code >= 200);
-	if (msec_time > pjsip_cfg()->tsx.t2)
-	    msec_time = pjsip_cfg()->tsx.t2;
+	/* For UAS, this can be retransmission of 2xx response for INVITE
+	 * or non-100 1xx response.
+	 */
+	if (tsx->status_code < 200) {
+	    /* non-100 1xx retransmission is at 60 seconds */
+	    msec_time = PJSIP_TSX_1XX_RETRANS_DELAY * 1000;
+	} else {
+	    /* Retransmission of INVITE final response also caps-off at T2 */
+	    pj_assert(tsx->status_code >= 200);
+	    if (msec_time > pjsip_cfg()->tsx.t2)
+		msec_time = pjsip_cfg()->tsx.t2;
+	}
     }
 
     timeout.sec = msec_time / 1000;
@@ -2338,8 +2353,42 @@ static pj_status_t tsx_on_state_proceeding_uas( pjsip_transaction *tsx,
 	    tsx_set_state( tsx, PJSIP_TSX_STATE_PROCEEDING, 
                            PJSIP_EVENT_TX_MSG, tdata );
 
+	    /* Retransmit provisional response every 1 minute if this is
+	     * an INVITE provisional response greater than 100.
+	     */
+	    if (PJSIP_TSX_1XX_RETRANS_DELAY > 0 && 
+		tsx->method.id==PJSIP_INVITE_METHOD && tsx->status_code>100)
+	    {
+
+		/* Stop 1xx retransmission timer, if any */
+		if (tsx->retransmit_timer.id) {
+		    pjsip_endpt_cancel_timer(tsx->endpt, 
+					     &tsx->retransmit_timer);
+		    tsx->retransmit_timer.id = 0;
+		}
+
+		/* Schedule retransmission */
+		tsx->retransmit_count = 0;
+		if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) {
+		    tsx->transport_flag |= TSX_HAS_PENDING_RESCHED;
+		} else {
+		    pj_time_val delay = {PJSIP_TSX_1XX_RETRANS_DELAY, 0};
+
+		    tsx->retransmit_timer.id = TIMER_ACTIVE;
+		    pjsip_endpt_schedule_timer( tsx->endpt, 
+						&tsx->retransmit_timer,
+						&delay);
+		}
+	    }
+
 	} else if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code, 200)) {
 
+	    /* Stop 1xx retransmission timer, if any */
+	    if (tsx->retransmit_timer.id) {
+		pjsip_endpt_cancel_timer(tsx->endpt, &tsx->retransmit_timer);
+		tsx->retransmit_timer.id = 0;
+	    }
+
 	    if (tsx->method.id == PJSIP_INVITE_METHOD && tsx->handle_200resp==0) {
 
 		/* 2xx class message is not saved, because retransmission 
@@ -2409,6 +2458,12 @@ static pj_status_t tsx_on_state_proceeding_uas( pjsip_transaction *tsx,
 
 	} else if (tsx->status_code >= 300) {
 
+	    /* Stop 1xx retransmission timer, if any */
+	    if (tsx->retransmit_timer.id) {
+		pjsip_endpt_cancel_timer(tsx->endpt, &tsx->retransmit_timer);
+		tsx->retransmit_timer.id = 0;
+	    }
+
 	    /* 3xx-6xx class message causes transaction to move to 
              * "Completed" state. 
              */
-- 
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