Index: chan_dahdi.c
===================================================================
--- chan_dahdi.c	(revision 274530)
+++ chan_dahdi.c	(working copy)
@@ -46,6 +46,11 @@
 	<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__, "$Revision$")
@@ -9129,6 +9134,16 @@
 	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 +9152,8 @@
 			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);