chan_dahdi: Fix broken operator mode clearing.

Currently, the operator services mode in DAHDI is broken and unusable.
The actual operator recall functionality works properly; however,
when the operator hangs up (which is the only way that such a call
is allowed to end), both lines are permanently taken out of service
until "dahdi restart" is run. This prevents this feature from being
used.

Operator mode is one of the few factors that can cause the general
analog event handling in sig_analog not to be used. Several years
back, much of the analog handling was moved from chan_dahdi to
sig_analog. However, this was not done fully or consistently at
the time, and when operator mode is active, sig_analog does not
get used. Generally this is correct, but in the case of hangup
it should be using sig_analog regardless of the operator mode;
otherwise, the lines do not properly clear and they become unusable.

This bug is fixed so the operator can now hang up and properly
release the call. It is treated just like any other hangup. The
operator mode functionality continues to work as it did before.

ASTERISK-29993 #close

Change-Id: Ib2e3ddb40d9c71e8801e0b4bb0a12e2b52f51d24

channels/chan_dahdi.c

@@ -6027,7 +6027,9 @@ static int dahdi_hangup(struct ast_channel *ast)
 
 	ast_mutex_lock(&p->lock);
 	p->exten[0] = '\0';
-	if (dahdi_analog_lib_handles(p->sig, p->radio, p->oprmode)) {
+	/* Always use sig_analog hangup handling for operator mode */
+	if (dahdi_analog_lib_handles(p->sig, p->radio, 0)) {
+		p->oprmode = 0;
 		dahdi_confmute(p, 0);
 		restore_gains(p);
 		p->ignoredtmf = 0;
@@ -7643,14 +7645,19 @@ static struct ast_frame *dahdi_handle_event(struct ast_channel *ast)
 		}
 		if (p->oprmode < 0)
 		{
-			if (p->oprmode != -1) break;
+			if (p->oprmode != -1) { /* Operator flash recall */
+				ast_verb(4, "Operator mode enabled on channel %d, holding line for channel %d\n", p->channel, p->oprpeer->channel);
+				break;
+			}
+			/* Otherwise, immediate recall */
 			if ((p->sig == SIG_FXOLS) || (p->sig == SIG_FXOKS) || (p->sig == SIG_FXOGS))
 			{
 				/* Make sure it starts ringing */
 				dahdi_set_hook(p->subs[SUB_REAL].dfd, DAHDI_RINGOFF);
 				dahdi_set_hook(p->subs[SUB_REAL].dfd, DAHDI_RING);
 				save_conference(p->oprpeer);
 				tone_zone_play_tone(p->oprpeer->subs[SUB_REAL].dfd, DAHDI_TONE_RINGTONE);
+				ast_verb(4, "Operator recall, channel %d ringing back channel %d\n", p->oprpeer->channel, p->channel);
 			}
 			break;
 		}
@@ -7763,6 +7770,7 @@ static struct ast_frame *dahdi_handle_event(struct ast_channel *ast)
 				dahdi_set_hook(p->subs[SUB_REAL].dfd, DAHDI_RINGOFF);
 				tone_zone_play_tone(p->oprpeer->subs[SUB_REAL].dfd, -1);
 				restore_conference(p->oprpeer);
+				ast_debug(1, "Operator recall by channel %d for channel %d complete\n", p->oprpeer->channel, p->channel);
 			}
 			break;
 		}
@@ -7976,6 +7984,7 @@ static struct ast_frame *dahdi_handle_event(struct ast_channel *ast)
 					dahdi_set_hook(p->oprpeer->subs[SUB_REAL].dfd, DAHDI_RING);
 					save_conference(p);
 					tone_zone_play_tone(p->subs[SUB_REAL].dfd, DAHDI_TONE_RINGTONE);
+					ast_verb(4, "Operator flash recall, channel %d ringing back channel %d\n", p->oprpeer->channel, p->channel);
 				}
 			}
 			break;