Prevent Echo() from relaying control, null, and modem frames

Echo()'s description states that it echoes audio, video, and DTMF except for #
while it actually echoes any frame that it receives other than DTMF #.  This
was causing frame storms in the test suite in some circumstances where Echo()
was attached to both ends of a pair of local channels and control frames
were being periodically generated.  Echo()'s behavior and description have
been modifed so that it only echoes media and non-# DTMF frames.
........

Merged revisions 360033 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 360034 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@360036 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/apps/app_echo.c b/apps/app_echo.c
index a8a7fd8..df5a914 100644 (file)
--- a/apps/app_echo.c
+++ b/apps/app_echo.c
@@ -40,12 +40,13 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 /*** DOCUMENTATION
        <application name="Echo" language="en_US">
                <synopsis>
-                       Echo audio, video, DTMF back to the calling party
+                       Echo media, DTMF back to the calling party
                </synopsis>
                <syntax />
                <description>
-                       <para>Echos back any audio, video or DTMF frames read from the calling 
-                       channel back to itself. Note: If '#' detected application exits</para>
+                       <para>Echos back any media or DTMF frames read from the calling 
+                       channel back to itself. This will not echo CONTROL, MODEM, or NULL
+                       frames. Note: If '#' detected application exits.</para>
                        <para>This application does not automatically answer and should be
                        preceeded by an application such as Answer() or Progress().</para>
                </description>
@@ -70,7 +71,10 @@ static int echo_exec(struct ast_channel *chan, const char *data)
                }
                f->delivery.tv_sec = 0;
                f->delivery.tv_usec = 0;
-               if (ast_write(chan, f)) {
+               if (f->frametype != AST_FRAME_CONTROL
+                       && f->frametype != AST_FRAME_MODEM
+                       && f->frametype != AST_FRAME_NULL
+                       && ast_write(chan, f)) {
                        ast_frfree(f);
                        goto end;
                }