enable IMSI ATTACH/DETACH
* this tells us whenever a MS is switched off
* also ensures that we get LOCATION UPDATe every time MS is switched on, even if it already has TMSI

diff --git a/src/bsc_hack.c b/src/bsc_hack.c
index 24d58df..a76e290 100644
--- a/src/bsc_hack.c
+++ b/src/bsc_hack.c
@@ -903,7 +903,7 @@
 
 	/* Control Channel Description */
 	memset(&bts->chan_desc, 0, sizeof(struct gsm48_control_channel_descr));
-	bts->chan_desc.att = 0;
+	bts->chan_desc.att = 1;
 	bts->chan_desc.ccch_conf = RSL_BCCH_CCCH_CONF_1_C;
 	bts->chan_desc.bs_pa_mfrms = RSL_BS_PA_MFRMS_5;
 	bts->chan_desc.t3212 = 0;