Setup DSP when SS7 call is connected or early media is available.

Outgoing SS7 calls fail to detect incoming DTMF so any bridged channel
that requires out-of-band DTMF will not work.

* Added sig_ss7_open_media() calls at appropriate places in sig_ss7.c.
The new call converts conditionaled out unconverted code and shows that
the code really did something useful.

* Improved some chan_dahdi DTMF debug messages to help track DTMF
handling.

(closes issue ASTERISK-19312)
Reported by: Igor Nikolaev
........

Merged revisions 358260 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@358261 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -2637,17 +2637,17 @@ static struct ast_channel *my_new_pri_ast_channel(void *pvt, int state, enum sig
 
 static int set_actual_gain(int fd, float rxgain, float txgain, float rxdrc, float txdrc, int law);
 
-#if defined(HAVE_PRI)
+#if defined(HAVE_PRI) || defined(HAVE_SS7)
 /*!
  * \internal
- * \brief Open the PRI channel media path.
+ * \brief Open the PRI/SS7 channel media path.
  * \since 1.8
  *
  * \param p Channel private control structure.
  *
  * \return Nothing
  */
-static void my_pri_open_media(void *p)
+static void my_pri_ss7_open_media(void *p)
 {
 	struct dahdi_pvt *pvt = p;
 	int res;
@@ -2686,7 +2686,7 @@ static void my_pri_open_media(void *p)
 		pvt->dsp_features = 0;
 	}
 }
-#endif	/* defined(HAVE_PRI) */
+#endif	/* defined(HAVE_PRI) || defined(HAVE_SS7) */
 
 #if defined(HAVE_PRI)
 /*!
@@ -3422,7 +3422,7 @@ static struct sig_pri_callback dahdi_pri_callbacks =
 	.module_ref = my_module_ref,
 	.module_unref = my_module_unref,
 	.dial_digits = my_pri_dial_digits,
-	.open_media = my_pri_open_media,
+	.open_media = my_pri_ss7_open_media,
 	.ami_channel_event = my_ami_channel_event,
 };
 #endif	/* defined(HAVE_PRI) */
@@ -3586,6 +3586,7 @@ static struct sig_ss7_callback dahdi_ss7_callbacks =
 	.set_remotelyblocked = my_set_remotelyblocked,
 	.set_callerid = my_set_callerid,
 	.set_dnid = my_set_dnid,
+	.open_media = my_pri_ss7_open_media,
 };
 #endif	/* defined(HAVE_SS7) */
 
@@ -4500,11 +4501,13 @@ static int dahdi_digit_begin(struct ast_channel *chan, char digit)
 		zo.dialstr[1] = digit;
 		zo.dialstr[2] = '\0';
 		if ((res = ioctl(pvt->subs[SUB_REAL].dfd, DAHDI_DIAL, &zo)))
-			ast_log(LOG_WARNING, "Couldn't dial digit %c: %s\n", digit, strerror(errno));
+			ast_log(LOG_WARNING, "Channel %s couldn't dial digit %c: %s\n",
+				chan->name, digit, strerror(errno));
 		else
 			pvt->dialing = 1;
 	} else {
-		ast_debug(1, "Started VLDTMF digit '%c'\n", digit);
+		ast_debug(1, "Channel %s started VLDTMF digit '%c'\n",
+			chan->name, digit);
 		pvt->dialing = 1;
 		pvt->begindigit = digit;
 	}
@@ -4540,7 +4543,8 @@ static int dahdi_digit_end(struct ast_channel *chan, char digit, unsigned int du
 
 	if (pvt->begindigit) {
 		x = -1;
-		ast_debug(1, "Ending VLDTMF digit '%c'\n", digit);
+		ast_debug(1, "Channel %s ending VLDTMF digit '%c'\n",
+			chan->name, digit);
 		res = ioctl(pvt->subs[SUB_REAL].dfd, DAHDI_SENDTONE, &x);
 		pvt->dialing = 0;
 		pvt->begindigit = 0;

channels/sig_ss7.c

@@ -151,6 +151,22 @@ static void sig_ss7_set_remotelyblocked(struct sig_ss7_chan *p, int is_blocked)
 	}
 }
 
+/*!
+ * \internal
+ * \brief Open the SS7 channel media path.
+ * \since 1.8.12
+ *
+ * \param p Channel private control structure.
+ *
+ * \return Nothing
+ */
+static void sig_ss7_open_media(struct sig_ss7_chan *p)
+{
+	if (p->calls->open_media) {
+		p->calls->open_media(p->chan_pvt);
+	}
+}
+
 /*!
  * \internal
  * \brief Set the caller id information in the parent module.
@@ -807,12 +823,7 @@ void *ss7_linkset(void *data)
 						sig_ss7_queue_control(linkset, chanpos, AST_CONTROL_PROGRESS);
 						p->progress = 1;
 						sig_ss7_set_dialing(p, 0);
-#if 0	/* This code no longer seems to be necessary so I did not convert it. */
-						if (p->dsp && p->dsp_features) {
-							ast_dsp_set_features(p->dsp, p->dsp_features);
-							p->dsp_features = 0;
-						}
-#endif
+						sig_ss7_open_media(p);
 					}
 					break;
 				default:
@@ -1184,12 +1195,8 @@ void *ss7_linkset(void *data)
 						p->call_level = SIG_SS7_CALL_LEVEL_CONNECT;
 					}
 					sig_ss7_queue_control(linkset, chanpos, AST_CONTROL_ANSWER);
-#if 0	/* This code no longer seems to be necessary so I did not convert it. */
-					if (p->dsp && p->dsp_features) {
-						ast_dsp_set_features(p->dsp, p->dsp_features);
-						p->dsp_features = 0;
-					}
-#endif
+					sig_ss7_set_dialing(p, 0);
+					sig_ss7_open_media(p);
 					sig_ss7_set_echocanceller(p, 1);
 					sig_ss7_unlock_private(p);
 				}
@@ -1622,6 +1629,7 @@ int sig_ss7_answer(struct sig_ss7_chan *p, struct ast_channel *ast)
 	if (p->call_level < SIG_SS7_CALL_LEVEL_CONNECT) {
 		p->call_level = SIG_SS7_CALL_LEVEL_CONNECT;
 	}
+	sig_ss7_open_media(p);
 	res = isup_anm(p->ss7->ss7, p->ss7call);
 	ss7_rel(p->ss7);
 	return res;

channels/sig_ss7.h

@@ -150,6 +150,7 @@ struct sig_ss7_callback {
 	void (* const set_dnid)(void *pvt, const char *dnid);
 
 	void (* const queue_control)(void *pvt, int subclass);
+	void (* const open_media)(void *pvt);
 };
 
 struct sig_ss7_chan {