Index: channels/chan_dahdi.c
===================================================================
--- channels/chan_dahdi.c	(revision 274530)
+++ channels/chan_dahdi.c	(working copy)
@@ -46,6 +46,12 @@
 	<use>openr2</use>
  ***/
 
+
+/* Define to have variables set in a PRI base channel */
+/* holding the span and the channel numbers.          */
+
+/* #define PRI_VARS 1 */
+
 #include "asterisk.h"
 
 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
@@ -6564,6 +6570,14 @@
 			break;
 		}
 		ast_mutex_unlock(&p->lock);
+	} else if (!strcasecmp(data, "pri_span")) {
+		ast_mutex_lock(&p->lock);
+        	snprintf(buf, len, "%d", p->span);
+		ast_mutex_unlock(&p->lock);
+	} else if (!strcasecmp(data, "pri_channel")) {
+		ast_mutex_lock(&p->lock);
+        	snprintf(buf, len, "%d", p->channel);
+		ast_mutex_unlock(&p->lock);
 #endif	/* defined(HAVE_PRI) */
 	} else {
 		*buf = '\0';
@@ -9129,6 +9143,16 @@
 	for (v = i->vars ; v ; v = v->next)
 		pbx_builtin_setvar_helper(tmp, v->name, v->value);
 
+#if defined(PRI_VARS)
+#if defined(HAVE_PRI)
+	char tmpvalue[256];
+	snprintf(tmpvalue, sizeof(tmpvalue), "%d", i->channel);
+	pbx_builtin_setvar_helper(tmp, "PRI_CHANNEL", tmpvalue);
+	snprintf(tmpvalue, sizeof(tmpvalue), "%d", i->span);
+	pbx_builtin_setvar_helper(tmp, "PRI_SPAN", tmpvalue); 
+#endif
+#endif
+
 	ast_module_ref(ast_module_info->self);
 
 	if (startpbx) {
@@ -9137,6 +9161,8 @@
 			pbx_builtin_setvar_helper(tmp, "MFCR2_CATEGORY", openr2_proto_get_category_string(i->mfcr2_recvd_category));
 		}
 #endif
+
+
 		if (ast_pbx_start(tmp)) {
 			ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
 			ast_hangup(tmp);
Index: funcs/func_channel.c
===================================================================
--- funcs/func_channel.c	(revision 274530)
+++ funcs/func_channel.c	(working copy)
@@ -228,6 +228,12 @@
 							<enum name="1 - Reverse Charging Requested" />
 						</enumlist>
 					</enum>
+					<enum name="pri_span">
+						<para>R/O Get the span related to this DAHDI channel.</para>
+					</enum>
+					<enum name="pri_channel">
+						<para>R/O Get the PRI channel related to this DAHDI channel.</para>
+					</enum>
 				</enumlist>
 			</parameter>
 		</syntax>