--- channels/chan_dahdi.c	2010-11-24 23:49:48.000000000 +0100
+++ channels/chan_dahdi.c	2011-02-11 12:10:24.000000000 +0100
@@ -570,6 +570,7 @@
 	int mastertrunkgroup;					/*!< What trunk group is our master */
 	int prilogicalspan;						/*!< Logical span number within trunk group */
 	struct sig_pri_span pri;
+	unsigned int bri_l1_check:1;
 };
 
 static struct dahdi_pri pris[NUM_SPANS];
@@ -1353,6 +1354,7 @@
 			.localprefix = "",
 			.privateprefix = "",
 			.unknownprefix = "",
+			.bri_l1_check = -1,
 			.resetinterval = -1,
 		},
 #endif
@@ -12191,6 +12193,8 @@
 						pris[span].pri.minunused = conf->pri.pri.minunused;
 						pris[span].pri.minidle = conf->pri.pri.minidle;
 						pris[span].pri.overlapdial = conf->pri.pri.overlapdial;
+                                                pris[span].bri_l1_check = ((SIG_BRI == chan_sig) | (SIG_BRI_PTMP == chan_sig))
+                                                                         ? conf->pri.bri_l1_check : 1;                        
 						pris[span].pri.qsigchannelmapping = conf->pri.pri.qsigchannelmapping;
 						pris[span].pri.discardremoteholdretrieval = conf->pri.pri.discardremoteholdretrieval;
 #if defined(HAVE_PRI_SERVICE_MESSAGES)
@@ -16646,6 +16650,10 @@
 			confp->chan.hanguponpolarityswitch = ast_true(v->value);
 		} else if (!strcasecmp(v->name, "sendcalleridafter")) {
 			confp->chan.sendcalleridafter = atoi(v->value);
+#ifdef HAVE_PRI
+                } else if (!strcasecmp(v->name, "bri_l1_check")) {
+                        confp->pri.bri_l1_check = ast_true(v->value);
+#endif
 		} else if (!strcasecmp(v->name, "mwimonitornotify")) {
 			ast_copy_string(mwimonitornotify, v->value, sizeof(mwimonitornotify));
 		} else if (ast_cc_is_config_param(v->name)) {
--- channels/sig_pri.c	2010-11-12 03:45:22.000000000 +0100
+++ channels/sig_pri.c	2011-02-11 12:20:25.000000000 +0100
@@ -4378,7 +4378,7 @@
 					ast_verb(2, "%s D-Channel on span %d up\n", pri_order(which), pri->span);
 				}
 				pri->dchanavail[which] |= DCHAN_UP;
-			} else {
+			} else if (pri->bri_l1_check) {
 				if (pri->dchanavail[which] & DCHAN_UP) {
 					ast_verb(2, "%s D-Channel on span %d down\n", pri_order(which), pri->span);
 				}
--- channels/sig_pri.h	2010-11-24 23:49:48.000000000 +0100
+++ channels/sig_pri.h	2011-02-11 12:20:30.000000000 +0100
@@ -416,6 +416,7 @@
 	pthread_t master;							/*!< Thread of master */
 	ast_mutex_t lock;							/*!< libpri access Mutex */
 	time_t lastreset;							/*!< time when unused channels were last reset */
+	unsigned int bri_l1_check:1;
 	struct sig_pri_callback *calls;
 	/*!
 	 * \brief Congestion device state of the span.