diff --git a/src/ax25.c b/src/ax25.c
index ba4aab7..9f5a6ce 100644
--- a/src/ax25.c
+++ b/src/ax25.c
@@ -92,6 +92,16 @@ patty_ax25_if *patty_ax25_create_if(patty_ax25 *ax25, int opts, void *info) {
     return NULL;
 }
 
+static uint32_t address_hash(patty_ax25_address *address) {
+    char key[10];
+
+    if (snprintf(key, sizeof(key), "%s/%d", callsign, ssid) < 0) {
+        goto error_snprintf_key;
+    }
+
+    return patty_hash(key, strlen(key));
+}
+
 patty_ax25_port *patty_ax25_listen(patty_ax25 *ax25, patty_ax25_if *iface, const char *callsign, int ssid) {
     patty_ax25_port *port;
     char key[10];
@@ -107,10 +117,6 @@ patty_ax25_port *patty_ax25_listen(patty_ax25 *ax25, patty_ax25_if *iface, const
     port->ssid     = ssid;
     port->repeated = 0;
 
-    if (snprintf(key, sizeof(key), "%s/%d", callsign, ssid) < 0) {
-        goto error_snprintf_key;
-    }
-
     if (patty_dict_set(iface->ports, (void *)key, strlen(key), port) == NULL) {
         goto error_dict_set_port;
     }
@@ -129,3 +135,17 @@ error_snprintf_key:
 error_malloc_port:
     return NULL;
 }
+
+int patty_ax25_shutdown(patty_ax25 *ax25, patty_ax25_port *port) {
+    int ret = 0;
+
+    if (patty_dict_delete(iface->ports, (void *)key, strlen(key)) == NULL) {
+        ret = -1;
+    }
+
+    if (patty_dict_delete(ax25->ports, (void *)key, strlen(key)) == NULL) {
+        ret = -1;
+    }
+
+    return ret;
+}