Index: channels/sig_pri.h
===================================================================
--- channels/sig_pri.h	(revision 204649)
+++ channels/sig_pri.h	(working copy)
@@ -162,6 +162,7 @@
 	struct sig_pri_callback *calls;
 	void *chan_pvt;
 	ast_mutex_t service_lock;						/*!< Mutex for service messages */
+	int reverse_charging_indication:3;
 };
 
 struct sig_pri_pri {
Index: channels/chan_dahdi.c
===================================================================
--- channels/chan_dahdi.c	(revision 204649)
+++ channels/chan_dahdi.c	(working copy)
@@ -5412,6 +5412,15 @@
 		ast_mutex_lock(&p->lock);
 		snprintf(buf, len, "%f", p->txgain);
 		ast_mutex_unlock(&p->lock);
+#if HAVE_PRI
+	} else if (!strcasecmp(data, "reversecharge")) {
+		ast_mutex_lock(&p->lock);
+		if (p->sig == SIG_PRI) {
+			struct sig_pri_pri *pri = p->pri;
+			/* snprintf(buf, len, "%d", p->reverse_charge_indication); */
+		}
+		ast_mutex_unlock(&p->lock);
+#endif
 	} else {
 		ast_copy_string(buf, "", len);
 		res = -1;
Index: channels/sig_pri.c
===================================================================
--- channels/sig_pri.c	(revision 204649)
+++ channels/sig_pri.c	(working copy)
@@ -1163,7 +1163,8 @@
 							pbx_builtin_setvar_helper(c, "CALLEDTON", calledtonstr);
 							if (e->ring.redirectingreason >= 0)
 								pbx_builtin_setvar_helper(c, "PRIREDIRECTREASON", redirectingreason2str(e->ring.redirectingreason));
-						
+							pri->pvts[chanpos]->reverse_charging_indication = e->ring.reversecharge;
+
 							sig_pri_lock_private(pri->pvts[chanpos]);
 							ast_mutex_lock(&pri->lock);
 
@@ -1208,7 +1209,8 @@
 
 								if (e->ring.redirectingreason >= 0)
 									pbx_builtin_setvar_helper(c, "PRIREDIRECTREASON", redirectingreason2str(e->ring.redirectingreason));
-							
+								pri->pvts[chanpos]->reverse_charging_indication = e->ring.reversecharge;
+
 								snprintf(calledtonstr, sizeof(calledtonstr)-1, "%d", e->ring.calledplan);
 								pbx_builtin_setvar_helper(c, "CALLEDTON", calledtonstr);
 
@@ -1888,6 +1890,11 @@
 		case 'r':
 			pridialplan = PRI_NPI_RESERVED | (pridialplan & 0xf0);
 			break;
+#if defined(PRI_REVERSECHARGE_REQUESTED)
+		case 'c':
+			pri_sr_set_reversecharge(sr, PRI_REVERSECHARGE_REQUESTED);
+			break;
+#endif
 		default:
 			if (isalpha(c[p->stripmsd])) {
 				ast_log(LOG_WARNING, "Unrecognized pridialplan %s modifier: %c\n",
Index: configs/chan_dahdi.conf.sample
===================================================================
--- configs/chan_dahdi.conf.sample	(revision 204649)
+++ configs/chan_dahdi.conf.sample	(working copy)
@@ -77,6 +77,11 @@
 ;service_message_support=yes
 ; Enable service message support for channel. Must be set after switchtype.
 ;
+; PRI Reverse Charging Indication: Indicate to the called party that the
+; incoming call will be reverse charged.  To enable, prefix the dialed number
+; with one of the following letters:
+; C - Reverse Charge Indication Requested
+;
 ; PRI Dialplan: The ISDN-level Type Of Number (TON) or numbering plan, used for
 ; the dialed number.  For most installations, leaving this as 'unknown' (the
 ; default) works in the most cases.  In some very unusual circumstances, you
@@ -104,7 +109,7 @@
 ;pridialplan=unknown
 ;prilocaldialplan=national
 ;
-; pridialplan may be also set at dialtime, by prefixing the dialled number with
+; pridialplan may be also set at dialtime, by prefixing the dialed number with
 ; one of the following letters:
 ; U - Unknown
 ; I - International