Add ability for dialplan execution to continue when caller hangs up.

The F option to app_dial has been modified to accept no parameters and perform
the above functionality. I don't see anywhere else that is doing function
overloading, but this really is the best place for this operation because:

- It makes it close to the 'g' option in the argument list which provides
similar functionality.
- The existing code to support the current F option provides a very
convienient location to add this new feature.

(closes issue #12381)
Reported by: michael-fig



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@187491 65c4cc65-6c06-0410-ace0-fbb531ad65f3

4 files changed, 22 insertions, 5 deletions

diff --git a/CHANGES b/CHANGES
index 9397ae104..1c7e5c982 100644
--- a/CHANGES
+++ b/CHANGES
@@ -24,6 +24,8 @@ Applications
  * Added progress option to the app_dial D() option.  When progress DTMF is
    present, those values are sent immediatly upon receiving a PROGRESS message
    regardless if the call has been answered or not.
+ * Added functionality to the app_dial F() option to continue with execution
+   at the current location when no parameters are provided.
 
 Dialplan Functions
 ------------------
diff --git a/apps/app_dial.c b/apps/app_dial.c
index f2cea75d2..8a2e152d6 100644
--- a/apps/app_dial.c
+++ b/apps/app_dial.c
@@ -133,6 +133,10 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 					<para>When the caller hangs up, transfer the called party
 					to the specified destination and continue execution at that location.</para>
 				</option>
+				<option name="F">
+					<para>Proceed with dialplan execution at the next priority in the current extension if the
+					source channel hangs up.</para>
+				</option>
 				<option name="g">
 					<para>Proceed with dialplan execution at the next priority in the current extension if the
 					destination channel hangs up.</para>
@@ -2332,9 +2336,18 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 			}
 			ast_set2_flag(peer, autoloopflag, AST_FLAG_IN_AUTOLOOP);  /* set it back the way it was */
 		}
-		if (!ast_check_hangup(peer) && ast_test_flag64(&opts, OPT_CALLEE_GO_ON) && !ast_strlen_zero(opt_args[OPT_ARG_CALLEE_GO_ON])) {		
-			replace_macro_delimiter(opt_args[OPT_ARG_CALLEE_GO_ON]);
-			ast_parseable_goto(peer, opt_args[OPT_ARG_CALLEE_GO_ON]);
+		if (!ast_check_hangup(peer) && ast_test_flag64(&opts, OPT_CALLEE_GO_ON)) {
+			if(!ast_strlen_zero(opt_args[OPT_ARG_CALLEE_GO_ON])) {
+				replace_macro_delimiter(opt_args[OPT_ARG_CALLEE_GO_ON]);
+				ast_parseable_goto(peer, opt_args[OPT_ARG_CALLEE_GO_ON]);
+			} else { /* F() */
+				int res;
+				res = ast_goto_if_exists(peer, chan->context, chan->exten, (chan->priority) + 1); 
+				if (res == AST_PBX_GOTO_FAILED) {
+					ast_hangup(peer);
+					goto out;
+				}
+			}
 			ast_pbx_start(peer);
 		} else {
 			if (!ast_check_hangup(chan))
diff --git a/include/asterisk/pbx.h b/include/asterisk/pbx.h
index d3cfb2630..cd327661f 100644
--- a/include/asterisk/pbx.h
+++ b/include/asterisk/pbx.h
@@ -34,6 +34,7 @@ extern "C" {
 
 #define AST_MAX_APP	32	/*!< Max length of an application */
 
+#define AST_PBX_GOTO_FAILED -3
 #define AST_PBX_KEEP    0
 #define AST_PBX_REPLACE 1
 
diff --git a/main/pbx.c b/main/pbx.c
index 2a1c9393d..6e7dd4ab0 100644
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -9461,8 +9461,9 @@ static int __ast_goto_if_exists(struct ast_channel *chan, const char *context, c
 	goto_func = (async) ? ast_async_goto : ast_explicit_goto;
 	if (ast_exists_extension(chan, context, exten, priority, chan->cid.cid_num))
 		return goto_func(chan, context, exten, priority);
-	else
-		return -3;
+	else {
+		return AST_PBX_GOTO_FAILED;
+	}
 }
 
 int ast_goto_if_exists(struct ast_channel *chan, const char* context, const char *exten, int priority)