Send CANCEL to call with early media (PROGRESS INBAND).

This is imported from branch "invitestate" and "invitestate-1.4"

***
***
*** IF YOU HAVE ISSUES WITH BYEs/CANCELs - PLEASE UPDATE AND TEST AGAIN!
*** 	Thank you!
***
***

/Olle


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48216 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -242,15 +242,15 @@ enum sip_result {
 	\note this is for the INVITE that sets up the dialog
 */
 enum invitestates {
-	INV_NONE = 0,	/*!< No state at all, maybe not an INVITE dialog */
-	INV_CALLING,	/*!< Invite sent, no answer */
-	INV_PROCEEDING,	/*!< We got/sent 1xx message */
-	INV_EARLY_MEDIA, /*!< We got 18x message with to-tag back */
-	INV_COMPLETED,	/*!< Got final response with error. Wait for ACK, then CONFIRMED */
-	INV_CONFIRMED,	/*!< Confirmed response - we've got an ack (Incoming calls only) */
-	INV_TERMINATED,	/*!< Transaction done - either successful (AST_STATE_UP) or failed, but done 
-				The only way out of this is a BYE from one side */
-	INV_CANCELLED	/*!< Transaction cancelled by client or server in non-terminated state */
+	INV_NONE = 0,	        /*!< No state at all, maybe not an INVITE dialog */
+	INV_CALLING = 1,	/*!< Invite sent, no answer */
+	INV_PROCEEDING = 2,	/*!< We got/sent 1xx message */
+	INV_EARLY_MEDIA = 3,    /*!< We got 18x message with to-tag back */
+	INV_COMPLETED = 4,	/*!< Got final response with error. Wait for ACK, then CONFIRMED */
+	INV_CONFIRMED = 5,	/*!< Confirmed response - we've got an ack (Incoming calls only) */
+	INV_TERMINATED = 6,	/*!< Transaction done - either successful (AST_STATE_UP) or failed, but done 
+				     The only way out of this is a BYE from one side */
+	INV_CANCELLED = 7,	/*!< Transaction cancelled by client or server in non-terminated state */
 };
 /* Do _NOT_ make any changes to this enum, or the array following it;
@@ -3413,7 +3413,7 @@ static int sip_hangup(struct ast_channel *ast)
 		return 0;
 	}
 	/* If the call is not UP, we need to send CANCEL instead of BYE */
-	if (ast->_state == AST_STATE_RING || ast->_state == AST_STATE_RINGING) {
+	if (p->invitestate < INV_COMPLETED) {
 		needcancel = TRUE;
 		if (option_debug > 3)
 			ast_log(LOG_DEBUG, "Hanging up channel in state %s (not UP)\n", ast_state2str(ast->_state));
@@ -3434,7 +3434,7 @@ static int sip_hangup(struct ast_channel *ast)
 	*/
 	if (ast_test_flag(&p->flags[0], SIP_ALREADYGONE))
 		needdestroy = 1;	/* Set destroy flag at end of this function */
-	else
+	else if (p->invitestate != INV_CALLING)
 		sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
 	/* Start the process if it's not already started */
@@ -3496,6 +3496,7 @@ static int sip_hangup(struct ast_channel *ast)
 				   but we can't send one while we have "INVITE" outstanding. */
 				ast_set_flag(&p->flags[0], SIP_PENDINGBYE);	
 				ast_clear_flag(&p->flags[0], SIP_NEEDREINVITE);	
+				sip_cancel_destroy(p);
 			}
 		}
 	}