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/branches/1.6.2@249321 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index c3057d4ce967c67bc7ac62ea02244f2ba34276e5..1d4c55a8861d99f15377ccdffc527a9f2e656ef7 100644 (file)
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -7757,7 +7757,20 @@ 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);