diff --git a/src/amps/amps.c b/src/amps/amps.c
index 4206adb..39435b5 100644
--- a/src/amps/amps.c
+++ b/src/amps/amps.c
@@ -1076,6 +1076,8 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 /* Timeout handling */
 void transaction_timeout(struct timer *timer)
 {
diff --git a/src/anetz/anetz.c b/src/anetz/anetz.c
index d447377..0aac909 100644
--- a/src/anetz/anetz.c
+++ b/src/anetz/anetz.c
@@ -540,5 +540,7 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 void dump_info(void) {}
 
diff --git a/src/bnetz/bnetz.c b/src/bnetz/bnetz.c
index 4c597bb..86229ea 100644
--- a/src/bnetz/bnetz.c
+++ b/src/bnetz/bnetz.c
@@ -862,5 +862,7 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 void dump_info(void) {}
 
diff --git a/src/cnetz/cnetz.c b/src/cnetz/cnetz.c
index 0fc2f0a..c9b958e 100644
--- a/src/cnetz/cnetz.c
+++ b/src/cnetz/cnetz.c
@@ -560,6 +560,8 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 int call_down_setup(int callref, const char __attribute__((unused)) *caller_id, enum number_type __attribute__((unused)) caller_type, const char *dialing)
 {
 	sender_t *sender;
diff --git a/src/eurosignal/dsp.c b/src/eurosignal/dsp.c
index d40c0d2..7119935 100644
--- a/src/eurosignal/dsp.c
+++ b/src/eurosignal/dsp.c
@@ -265,13 +265,6 @@ void sender_receive(sender_t *sender, sample_t *samples, int length, double __at
 
 	if (euro->rx)
 		tone_decode(euro, down, count);
-
-	/* whenever a chunk of anouncement audio should be played toward caller */
-	euro->chunk_count += count;
-	if (euro->chunk_count >= 160) {
-		euro->chunk_count -= 160;
-		euro_clock_chunk(sender);
-	}
 }
 
 /* Generate tone of paging digits. */
diff --git a/src/eurosignal/eurosignal.c b/src/eurosignal/eurosignal.c
index 39a9cf0..21a2730 100644
--- a/src/eurosignal/eurosignal.c
+++ b/src/eurosignal/eurosignal.c
@@ -525,31 +525,34 @@ static void call_play_beep(euro_call_t *call)
 }
 
 /* loop through all calls and play the announcement */
-void euro_clock_chunk(sender_t *sender)
+void call_down_clock(void)
 {
+	sender_t *sender;
 	euro_t *euro;
 	euro_call_t *call;
 
-	if (sender == sender_head) {
-		/* use first tranceiver clock to clock calls without a transceiver */
-		for (call = ooo_call_list; call; call = call->next) {
-			/* no callref */
-			if (!call->callref)
-				continue;
-			/* beep or announcement */
-			if (call->state == EURO_CALL_BEEPING)
-				call_play_beep(call);
-			else
-				call_play_announcement(call);
-		}
-	}
-	euro = (euro_t *) sender;
-	for (call = euro->call_list; call; call = call->next) {
+	/* clock all calls without a transceiver */
+	for (call = ooo_call_list; call; call = call->next) {
 		/* no callref */
 		if (!call->callref)
 			continue;
-		/* announcement */
-		call_play_announcement(call);
+		/* beep or announcement */
+		if (call->state == EURO_CALL_BEEPING)
+			call_play_beep(call);
+		else
+			call_play_announcement(call);
+	}
+
+	/* clock all calls that have a transceiver */
+	for (sender = sender_head; sender; sender = sender->next) {
+		euro = (euro_t *) sender;
+		for (call = euro->call_list; call; call = call->next) {
+			/* no callref */
+			if (!call->callref)
+				continue;
+			/* announcement */
+			call_play_announcement(call);
+		}
 	}
 }
 
diff --git a/src/eurosignal/eurosignal.h b/src/eurosignal/eurosignal.h
index a66e3fe..2b48677 100644
--- a/src/eurosignal/eurosignal.h
+++ b/src/eurosignal/eurosignal.h
@@ -67,7 +67,6 @@ typedef struct eurosignal {
 	double			tx_time;		/* current elapsed time of tone */
 	char			tx_digits[7];		/* current ID beeing transmitted */
 	int			tx_digit_index;		/* current digit beein transmitted */
-	int			chunk_count;		/* current elapsed sample of 20ms audio chunk */
 	fm_demod_t		rx_demod;		/* demodulator for frequency */
 	iir_filter_t		rx_lp;			/* low pass to filter the frequency result */
 	int			rx_digit_count;		/* count the tone until detected */
@@ -87,5 +86,4 @@ int euro_create(const char *kanal, const char *audiodev, int use_sdr, int sample
 void euro_destroy(sender_t *sender);
 void euro_get_id(euro_t *euro, char *id);
 void euro_receive_id(euro_t *euro, char *id);
-void euro_clock_chunk(sender_t *sender);
 
diff --git a/src/imts/imts.c b/src/imts/imts.c
index 2056806..721fb51 100644
--- a/src/imts/imts.c
+++ b/src/imts/imts.c
@@ -1322,5 +1322,7 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 void dump_info(void) {}
 
diff --git a/src/jolly/jolly.c b/src/jolly/jolly.c
index 33dd0b8..ba21d74 100644
--- a/src/jolly/jolly.c
+++ b/src/jolly/jolly.c
@@ -632,5 +632,7 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 void dump_info(void) {}
 
diff --git a/src/libmobile/call.c b/src/libmobile/call.c
index 7c51df1..1338f9d 100644
--- a/src/libmobile/call.c
+++ b/src/libmobile/call.c
@@ -586,6 +586,8 @@ void call_clock(void)
 	uint8_t buf[sizeof(struct gsm_data_frame) + 160 * sizeof(int16_t)];
 	struct gsm_data_frame *data = (struct gsm_data_frame *)buf;
 
+	call_down_clock();
+
 	while(process) {
 		if (process->pattern != PATTERN_NONE) {
 			data->msg_type = ANALOG_8000HZ;
diff --git a/src/libmobile/call.h b/src/libmobile/call.h
index 7273a1e..f87051d 100644
--- a/src/libmobile/call.h
+++ b/src/libmobile/call.h
@@ -36,5 +36,6 @@ void call_up_audio(int callref, sample_t *samples, int count);
 void call_down_audio(int callref, sample_t *samples, int count);
 
 /* clock to transmit to */
-void call_clock(void);
+void call_clock(void); /* from main loop */
+void call_down_clock(void); /* towards mobile implementation */
 
diff --git a/src/nmt/nmt.c b/src/nmt/nmt.c
index 3d0f75d..7b7ff73 100644
--- a/src/nmt/nmt.c
+++ b/src/nmt/nmt.c
@@ -1905,6 +1905,8 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 /*
  * SMS layer messages
  */
diff --git a/src/r2000/r2000.c b/src/r2000/r2000.c
index 535c0a8..d542dd6 100644
--- a/src/r2000/r2000.c
+++ b/src/r2000/r2000.c
@@ -1582,5 +1582,7 @@ void call_down_audio(int callref, sample_t *samples, int count)
 	}
 }
 
+void call_down_clock(void) {}
+
 void dump_info(void) {}
 
diff --git a/src/test/test_dms.c b/src/test/test_dms.c
index 379eaa6..a64bf43 100644
--- a/src/test/test_dms.c
+++ b/src/test/test_dms.c
@@ -253,5 +253,7 @@ int main(void)
 	return 0;
 }
 
+void call_down_clock(void) {}
+
 void print_image(void) {}
 
diff --git a/src/test/test_sms.c b/src/test/test_sms.c
index 7f901ad..f9f2cd2 100644
--- a/src/test/test_sms.c
+++ b/src/test/test_sms.c
@@ -162,5 +162,7 @@ int main(void)
 	return 0;
 }
 
+void call_down_clock(void) {}
+
 void print_image(void) {}