diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 32fb8e4..72239e0 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -50,6 +50,7 @@
 #include <openbsc/gprs_llc.h>
 #include <openbsc/gprs_sgsn.h>
 #include <openbsc/gprs_gmm.h>
+#include <openbsc/gprs_utils.h>
 #include <openbsc/sgsn.h>
 
 #include <pdp.h>
@@ -64,7 +65,7 @@
 
 /* Section 11.2.2 / Table 11.4a MM timers netwokr side */
 #define GSM0408_T3313_SECS	30	/* waiting for paging response */
-#define GSM0408_T3314_SECS	44	/* force to STBY on expiry */
+#define GSM0408_T3314_SECS	44	/* force to STBY on expiry, Ready timer */
 #define GSM0408_T3316_SECS	44
 
 /* Section 11.3 / Table 11.2d Timers of Session Management - network side */
@@ -338,8 +339,13 @@
 	ptsig[1] = mm->p_tmsi_sig >> 8;
 	ptsig[2] = mm->p_tmsi_sig & 0xff;
 
-	/* Optional: Negotiated Ready timer value */
 #endif
+	/* Optional: Negotiated Ready timer value
+	 * (fixed 44s, default value, GSM 04.08, table 11.4a) to safely limit
+	 * the inactivity time READY->STANDBY.
+	 */
+	msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY,
+		    gprs_secs_to_tmr_floor(GSM0408_T3314_SECS));
 
 #ifdef PTMSI_ALLOC
 	/* Optional: Allocated P-TMSI */
@@ -992,6 +998,10 @@
 	mid[0] = GSM48_IE_GMM_ALLOC_PTMSI;
 #endif
 
+	/* Optional: Negotiated READY timer value */
+	msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY,
+		    gprs_secs_to_tmr_floor(GSM0408_T3314_SECS));
+
 	/* Option: MS ID, ... */
 	return gsm48_gmm_sendmsg(msg, 0, mm);
 }