Add option to wait to be able to explicitly send ACM via the Proceeding() application in the dialplan. Also minor documentation update explaining how to setup multiple signalling links within a linkset

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@128122 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -339,6 +339,8 @@ static int ringt_base = DEFAULT_RINGT;
 
 #define SS7_NAI_DYNAMIC		-1
 
+#define LINKSET_FLAG_EXPLICITACM (1 << 0)
+
 struct dahdi_ss7 {
 	pthread_t master;						/*!< Thread of master */
 	ast_mutex_t lock;
@@ -359,6 +361,7 @@ struct dahdi_ss7 {
 	char unknownprefix[20];						/*!< for unknown dialplans */
 	struct ss7 *ss7;
 	struct dahdi_pvt *pvts[MAX_CHANNELS];				/*!< Member channel pvt structs */
+	int flags;							/*!< Linkset flags */
 };
 
 static struct dahdi_ss7 linksets[NUM_SPANS];
@@ -9303,8 +9306,10 @@ static void ss7_start_call(struct dahdi_pvt *p, struct dahdi_ss7 *linkset)
 	if (res < 0) 
 		ast_log(LOG_WARNING, "Unable to set law on channel %d\n", p->channel);
 	
-	p->proceeding = 1;
-	isup_acm(ss7, p->ss7call);
+	if (!(linkset->flags & LINKSET_FLAG_EXPLICITACM)) {
+		p->proceeding = 1;
+		isup_acm(ss7, p->ss7call);
+	}
 
 	ast_mutex_unlock(&linkset->lock);
 	c = dahdi_new(p, AST_STATE_RING, 1, SUB_REAL, law, 0);

configs/chan_dahdi.conf.sample

@@ -892,6 +892,11 @@ pickupgroup=1
 ;ss7_unknownprefix = 
 ;
 
+; This option is used to disable automatic sending of ACM when the call is started
+; in the dialplan.  If you do use this option, you will need to use the Proceeding()
+; application in the dialplan to send ACM.
+;ss7_explictacm=yes
+
 ; All settings apply to linkset 1
 ;linkset = 1
 
@@ -919,6 +924,12 @@ pickupgroup=1
 ; First signalling channel
 ;sigchan = 48
 
+; Additional signalling channel for this linkset (So you can have a linkset
+; with two signalling links in it).  It seems like a silly way to do it, but
+; for linksets with multiple signalling links, you add an additional sigchan
+; line for every additional signalling link on the linkset.
+;sigchan = 96
+
 ; Channels to associate with CICs on this linkset
 ;channel = 25-47
 ;