diff --git a/src/golay/golay.c b/src/golay/golay.c
index 3f1d8e8..9b8aca8 100644
--- a/src/golay/golay.c
+++ b/src/golay/golay.c
@@ -240,6 +240,7 @@ static const uint16_t preamble_values[] = {
 };
 
 static const uint32_t start_code = 713;
+static const uint32_t activation_code = 2563;
 
 /* Rep. 900-2 Table VI */
 static const uint16_t word1s[50] = {
@@ -660,9 +661,20 @@ static int queue_batch(gsc_t *gsc, const char *address, int force_type, const ch
 		}
 	}
 
-	/* encode comma after message and store */
-	PDEBUG(DGOLAY, DEBUG_DEBUG, "Encoding 'comma' sequence after message.\n");
-	queue_comma(gsc, 121 * 8, 1);
+	if (type == TYPE_VOICE) {
+		/* encode activation code and store */
+		PDEBUG(DGOLAY, DEBUG_DEBUG, "Encoding activation code.\n");
+		golay = calc_golay(activation_code);
+		queue_comma(gsc, 28, golay & 1);
+		queue_dup(gsc, golay, 23);
+		golay ^= 0x7fffff;
+		queue_bit(gsc, (golay & 1) ^ 1);
+		queue_dup(gsc, golay, 23);
+	} else {
+		/* encode comma after message and store */
+		PDEBUG(DGOLAY, DEBUG_DEBUG, "Encoding 'comma' sequence after message.\n");
+		queue_comma(gsc, 121 * 8, 1);
+	}
 
 	/* check overflow */
 	if (gsc->bit_overflow) {