DNID does not get cleard on a new call when using immediate=yes with ISDN signaling.

When you are using chan_dahdi ISDN signaling with immediate=yes and a call
comes in without a DNID then you get the DNID of a previous call.
Chan_dahdi does not touch the DNID field on a new call if it does not have
a DNID.

Made always copy the DNID from the new call.

The patches backport the relevant changes from trunk -r210387.

(closes issue #17568)
Reported by: wuwu
Patches:
      issue17568_v1.4.patch uploaded by rmudgett (license 664)
      issue17568_v1.6.2.patch uploaded by rmudgett (license 664)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@278703 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -12966,6 +12966,10 @@ static void *pri_dchannel(void *vpri)
 					}
 					apply_plan_to_number(pri->pvts[chanpos]->rdnis, sizeof(pri->pvts[chanpos]->rdnis), pri,
 						e->ring.redirectingnum, e->ring.callingplanrdnis);
+
+					/* Set DNID on all incoming calls -- even immediate */
+					ast_copy_string(pri->pvts[chanpos]->dnid, e->ring.callednum, sizeof(pri->pvts[chanpos]->dnid));
+
 					/* If immediate=yes go to s|1 */
 					if (pri->pvts[chanpos]->immediate) {
 						ast_verb(3, "Going to extension s|1 because of immediate=yes\n");
@@ -12975,7 +12979,6 @@ static void *pri_dchannel(void *vpri)
 					/* Get called number */
 					else if (!ast_strlen_zero(e->ring.callednum)) {
 						ast_copy_string(pri->pvts[chanpos]->exten, e->ring.callednum, sizeof(pri->pvts[chanpos]->exten));
-						ast_copy_string(pri->pvts[chanpos]->dnid, e->ring.callednum, sizeof(pri->pvts[chanpos]->dnid));
 					} else if (pri->overlapdial)
 						pri->pvts[chanpos]->exten[0] = '\0';
 					else {
@@ -12983,9 +12986,6 @@ static void *pri_dchannel(void *vpri)
 						pri->pvts[chanpos]->exten[0] = 's';
 						pri->pvts[chanpos]->exten[1] = '\0';
 					}
-					/* Set DNID on all incoming calls -- even immediate */
-					if (!ast_strlen_zero(e->ring.callednum))
-						ast_copy_string(pri->pvts[chanpos]->dnid, e->ring.callednum, sizeof(pri->pvts[chanpos]->dnid));
 					/* No number yet, but received "sending complete"? */
 					if (e->ring.complete && (ast_strlen_zero(e->ring.callednum))) {
 						ast_verb(3, "Going to extension s|1 because of Complete received\n");