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:
      based on overlap_receiving_trunk.diff.txt uploaded by alecdavis (license 585)
Tested by: alecdavis

(closes issue #16789)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@249365 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index 67d0d1736fbdb1455343ee022bc833ba01a979b0..954c7235213c81c1e9ef840f781c087fc560f970 100644 (file)
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -5959,7 +5959,20 @@ static void *ss_thread(void *data)
                if (ast_exists_extension(chan, chan->context, exten, 1, p->cid_num)) {
                        /* Start the real PBX */
                        ast_copy_string(chan->exten, exten, sizeof(chan->exten));
-                       if (p->dsp) ast_dsp_digitreset(p->dsp);
+                       if (p->dsp) {
+                               ast_dsp_digitreset(p->dsp);
+                       }
+                       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->span);
+                                       }
+                               }
+                       }
                        dahdi_enable_ec(p);
                        ast_setstate(chan, AST_STATE_RING);
                        res = ast_pbx_run(chan);