overlap receiving: automatically send CALL PROCEEDING when dialplan starts

Following Q.931 5.2.4
When the user has determined that sufficient call information has been received the
user shall stop T302 and send CALL PROCEEDING to the network.

Previously timeouts were possible if the dialplan took a long time to issue any
response back to the network.

Verified that our local TELCO also does the same.

(issue #16789)
Reported by: alecdavis
Patches:
      overlap_receiving_trunk.diff.txt uploaded by alecdavis (license 585)
Tested by: alecdavis

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@249320 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/sig_pri.c b/channels/sig_pri.c
index 76f8f41e0a8ac1a38d5403e944fd6d3e9f41bbf3..8997f68409231de05c9bd8a8a68c720f2f3bc3ed 100644 (file)
--- a/channels/sig_pri.c
+++ b/channels/sig_pri.c
@@ -1308,6 +1308,18 @@ static void *pri_ss_thread(void *data)
                /* Start the real PBX */
                ast_copy_string(chan->exten, exten, sizeof(chan->exten));
                sig_pri_dsp_reset_and_flush_digits(p);
+               if (p->pri->overlapdial & DAHDI_OVERLAPDIAL_INCOMING) {
+                       if (p->pri->pri) {              
+                               if (!pri_grab(p, p->pri)) {
+                                       pri_proceeding(p->pri->pri, p->call, PVT_TO_CHANNEL(p), 0);
+                                       p->proceeding = 1;
+                                       pri_rel(p->pri);
+                               } else {
+                                       ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->pri->span);
+                               }
+                       }
+               }
+
                sig_pri_set_echocanceller(p, 1);
                ast_setstate(chan, AST_STATE_RING);
                res = ast_pbx_run(chan);