diff --git a/src/amps/main.c b/src/amps/main.c
index cc15575..0d78703 100644
--- a/src/amps/main.c
+++ b/src/amps/main.c
@@ -365,7 +365,7 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Error setting SCHED_RR with prio %d\n", rt_prio);
 	}
 
-	main_loop(&quit, latency, interval);
+	main_loop(&quit, latency, interval, NULL);
 
 	if (rt_prio > 0) {
 		struct sched_param schedp;
diff --git a/src/anetz/main.c b/src/anetz/main.c
index f67abbe..76c56aa 100644
--- a/src/anetz/main.c
+++ b/src/anetz/main.c
@@ -193,7 +193,7 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Error setting SCHED_RR with prio %d\n", rt_prio);
 	}
 
-	main_loop(&quit, latency, interval);
+	main_loop(&quit, latency, interval, NULL);
 
 	if (rt_prio > 0) {
 		struct sched_param schedp;
diff --git a/src/bnetz/main.c b/src/bnetz/main.c
index 44379bb..0e69b80 100644
--- a/src/bnetz/main.c
+++ b/src/bnetz/main.c
@@ -208,7 +208,7 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Error setting SCHED_RR with prio %d\n", rt_prio);
 	}
 
-	main_loop(&quit, latency, interval);
+	main_loop(&quit, latency, interval, NULL);
 
 	if (rt_prio > 0) {
 		struct sched_param schedp;
diff --git a/src/cnetz/main.c b/src/cnetz/main.c
index 1027b34..2cc9c54 100644
--- a/src/cnetz/main.c
+++ b/src/cnetz/main.c
@@ -313,7 +313,7 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Error setting SCHED_RR with prio %d\n", rt_prio);
 	}
 
-	main_loop(&quit, latency, interval);
+	main_loop(&quit, latency, interval, NULL);
 
 	if (rt_prio > 0) {
 		struct sched_param schedp;
diff --git a/src/common/main.h b/src/common/main.h
index 6a67717..c2abb6f 100644
--- a/src/common/main.h
+++ b/src/common/main.h
@@ -37,5 +37,5 @@ void opt_switch_common(int c, char *arg0, int *skip_args);
 extern int quit;
 void sighandler(int sigset);
 
-void main_loop(int *quit, int latency, int interval);
+void main_loop(int *quit, int latency, int interval, void (*myhandler)(void));
 
diff --git a/src/common/main_common.c b/src/common/main_common.c
index 68d8584..ac223f4 100644
--- a/src/common/main_common.c
+++ b/src/common/main_common.c
@@ -277,7 +277,7 @@ static int get_char()
 }
 
 /* Loop through all transceiver instances of one network. */
-void main_loop(int *quit, int latency, int interval)
+void main_loop(int *quit, int latency, int interval, void (*myhandler)(void))
 {
 	int latspl;
 	sender_t *sender;
@@ -332,6 +332,9 @@ next_char:
 		/* process audio of built-in call control */
 		process_call(c);
 
+		if (myhandler)
+			myhandler();
+
 		/* sleep a while */
 		usleep(interval * 1000);
 	}
diff --git a/src/nmt/main.c b/src/nmt/main.c
index d696c6f..3e9356b 100644
--- a/src/nmt/main.c
+++ b/src/nmt/main.c
@@ -286,7 +286,7 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Error setting SCHED_RR with prio %d\n", rt_prio);
 	}
 
-	main_loop(&quit, latency, interval);
+	main_loop(&quit, latency, interval, NULL);
 
 	if (rt_prio > 0) {
 		struct sched_param schedp;