diff --git a/src/pstn/pstn.c b/src/pstn/pstn.c
index c2d6304..e2d16f2 100644
--- a/src/pstn/pstn.c
+++ b/src/pstn/pstn.c
@@ -623,10 +623,10 @@ void recv_dtmf(void *priv, char digit, dtmf_meas_t __attribute__((unused)) *meas
 	pulse_off(pstn);
 	/* stop tone */
 	tone_off(pstn);
-	/* stop timer */
-	timer_off(pstn);
 	/* if we are receiving digits en block */
 	if (pstn->call[PSTN_CALL_ACTIVE]->state == CALL_STATE_ENBLOCK) {
+		/* stop timer */
+		timer_off(pstn);
 		if (digit == '#') {
 			PDEBUG(DTEL, DEBUG_DEBUG, "Digit '#' received, number is complete, send setup\n");
 			/* setup (en block) */
@@ -1206,8 +1206,11 @@ void cc_message(osmo_cc_endpoint_t *ep, uint32_t callref, osmo_cc_msg_t *msg)
 			release_call(pstn, hold, isdn_cause);
 			break;
 		}
-		/* stop timer */
-		timer_off(pstn);
+		/* keep hookflash timer running */
+		if (pstn->timer_ident != TIMER_IDENT_HOOKFLASH) {
+			/* stop timer */
+			timer_off(pstn);
+		}
 		/* release ringing call (or call that rings because it is on hold) */
 		if (pstn_call->state == CALL_STATE_ALERTING_SUB
 		 || pstn_call->state == CALL_STATE_HOLD) {
@@ -1239,8 +1242,11 @@ void cc_message(osmo_cc_endpoint_t *ep, uint32_t callref, osmo_cc_msg_t *msg)
 			release_call(pstn, hold, isdn_cause);
 			break;
 		}
-		/* stop timer */
-		timer_off(pstn);
+		/* keep hookflash timer running */
+		if (pstn->timer_ident != TIMER_IDENT_HOOKFLASH) {
+			/* stop timer */
+			timer_off(pstn);
+		}
 		/* negotiate audio */
 		rc = osmo_cc_helper_audio_negotiate(msg, &pstn_call->cc_session, &pstn_call->codec);
 		if (rc < 0) {