Add ability for chan_dahdi ISDN to block connected line updates per span.

Added new chan_dahdi.conf colp_send option parameter to block connected
line updates per span.

(closes issue ASTERISK-17025)
Reported by: Michael Smith


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@358997 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -1407,6 +1407,7 @@ static struct dahdi_chan_conf dahdi_chan_conf_default(void)
 			.localprefix = "",
 			.privateprefix = "",
 			.unknownprefix = "",
+			.colp_send = SIG_PRI_COLP_UPDATE,
 			.resetinterval = -1,
 		},
 #endif
@@ -12691,6 +12692,7 @@ static struct dahdi_pvt *mkintf(int channel, const struct dahdi_chan_conf *conf,
 #if defined(HAVE_PRI_L2_PERSISTENCE)
 						pris[span].pri.l2_persistence = conf->pri.pri.l2_persistence;
 #endif	/* defined(HAVE_PRI_L2_PERSISTENCE) */
+						pris[span].pri.colp_send = conf->pri.pri.colp_send;
 #if defined(HAVE_PRI_AOC_EVENTS)
 						pris[span].pri.aoc_passthrough_flag = conf->pri.pri.aoc_passthrough_flag;
 						pris[span].pri.aoce_delayhangup = conf->pri.pri.aoce_delayhangup;
@@ -17975,6 +17977,16 @@ static int process_dahdi(struct dahdi_chan_conf *confp, const char *cat, struct
 					confp->pri.pri.l2_persistence = PRI_L2_PERSISTENCE_DEFAULT;
 				}
 #endif	/* defined(HAVE_PRI_L2_PERSISTENCE) */
+			} else if (!strcasecmp(v->name, "colp_send")) {
+				if (!strcasecmp(v->value, "block")) {
+					confp->pri.pri.colp_send = SIG_PRI_COLP_BLOCK;
+				} else if (!strcasecmp(v->value, "connect")) {
+					confp->pri.pri.colp_send = SIG_PRI_COLP_CONNECT;
+				} else if (!strcasecmp(v->value, "update")) {
+					confp->pri.pri.colp_send = SIG_PRI_COLP_UPDATE;
+				} else {
+					confp->pri.pri.colp_send = SIG_PRI_COLP_UPDATE;
+				}
 #endif /* HAVE_PRI */
 #if defined(HAVE_SS7)
 			} else if (!strcasecmp(v->name, "ss7type")) {

channels/sig_pri.c

@@ -8019,8 +8019,34 @@ int sig_pri_indicate(struct sig_pri_chan *p, struct ast_channel *chan, int condi
 			struct pri_party_connected_line connected;
 			int dialplan;
 			int prefix_strip;
+			int colp_allowed = 0;
 
 			pri_grab(p, p->pri);
+
+			/* Check if a connected line update is allowed at this time. */
+			switch (p->pri->colp_send) {
+			case SIG_PRI_COLP_BLOCK:
+				break;
+			case SIG_PRI_COLP_CONNECT:
+				/*
+				 * Outgoing calls receive CONNECT and act like an update before
+				 * the call is connected.
+				 */
+				if (p->call_level <= SIG_PRI_CALL_LEVEL_ALERTING && !p->outgoing) {
+					colp_allowed = 1;
+				}
+				break;
+			case SIG_PRI_COLP_UPDATE:
+				colp_allowed = 1;
+				break;
+			}
+			if (!colp_allowed) {
+				pri_rel(p->pri);
+				ast_debug(1, "Blocked AST_CONTROL_CONNECTED_LINE on %s\n",
+					ast_channel_name(chan));
+				break;
+			}
+
 			memset(&connected, 0, sizeof(connected));
 			sig_pri_party_id_from_ast(&connected.id, &ast_channel_connected(chan)->id);
 

channels/sig_pri.h

@@ -391,6 +391,15 @@ struct sig_pri_mbox {
 };
 #endif	/* defined(HAVE_PRI_MWI) */
 
+enum sig_pri_colp_signaling {
+	/*! Block all connected line updates. */
+	SIG_PRI_COLP_BLOCK,
+	/*! Only send connected line information with the CONNECT message. */
+	SIG_PRI_COLP_CONNECT,
+	/*! Allow all connected line updates. */
+	SIG_PRI_COLP_UPDATE,
+};
+
 struct sig_pri_span {
 	/* Should be set by user */
 	struct ast_cc_config_params *cc_params;			/*!< CC config parameters for each new call. */
@@ -452,6 +461,8 @@ struct sig_pri_span {
 	char privateprefix[20];					/*!< for private dialplans */
 	char unknownprefix[20];					/*!< for unknown dialplans */
 	enum sig_pri_moh_signaling moh_signaling;
+	/*! Send connected line signaling to peer option. */
+	enum sig_pri_colp_signaling colp_send;
 	long resetinterval;						/*!< Interval (in seconds) for resetting unused channels */
 #if defined(HAVE_PRI_DISPLAY_TEXT)
 	unsigned long display_flags_send;		/*!< PRI_DISPLAY_OPTION_xxx flags for display text sending */

configs/chan_dahdi.conf.sample

@@ -249,6 +249,15 @@ context=public
 ;
 ;datetime_send=
 
+; Send ISDN conected line information.
+;
+; block:   Do not send any connected line information.
+; connect: Send connected line information on initial connect.
+; update:  Same as connect but also send any updates during a call.
+;          Updates happen if the call is transferred. (Default)
+;
+;colp_send=update
+
 ; Allow inband audio (progress) when a call is DISCONNECTed by the far end of a PRI
 ;
 ;inbanddisconnect=yes