diff --git a/include/zephyr/modem/cmux.h b/include/zephyr/modem/cmux.h
index 4562cb544d9..58959d6136b 100644
--- a/include/zephyr/modem/cmux.h
+++ b/include/zephyr/modem/cmux.h
@@ -63,10 +63,7 @@ enum modem_cmux_state {
 
 enum modem_cmux_receive_state {
 	MODEM_CMUX_RECEIVE_STATE_SOF = 0,
-	MODEM_CMUX_RECEIVE_STATE_RESYNC_0,
-	MODEM_CMUX_RECEIVE_STATE_RESYNC_1,
-	MODEM_CMUX_RECEIVE_STATE_RESYNC_2,
-	MODEM_CMUX_RECEIVE_STATE_RESYNC_3,
+	MODEM_CMUX_RECEIVE_STATE_RESYNC,
 	MODEM_CMUX_RECEIVE_STATE_ADDRESS,
 	MODEM_CMUX_RECEIVE_STATE_ADDRESS_CONT,
 	MODEM_CMUX_RECEIVE_STATE_CONTROL,
diff --git a/subsys/modem/modem_cmux.c b/subsys/modem/modem_cmux.c
index 258f969c498..472d1a7149a 100644
--- a/subsys/modem/modem_cmux.c
+++ b/subsys/modem/modem_cmux.c
@@ -642,13 +642,6 @@ static void modem_cmux_on_frame(struct modem_cmux *cmux)
 	modem_cmux_on_dlci_frame(cmux);
 }
 
-static void modem_cmux_transmit_resync(struct modem_cmux *cmux)
-{
-	static const uint8_t resync[3] = {0xF9, 0xF9, 0xF9};
-
-	modem_pipe_transmit(cmux->pipe, resync, sizeof(resync));
-}
-
 static void modem_cmux_process_received_byte(struct modem_cmux *cmux, uint8_t byte)
 {
 	uint8_t fcs;
@@ -656,46 +649,23 @@ static void modem_cmux_process_received_byte(struct modem_cmux *cmux, uint8_t by
 	switch (cmux->receive_state) {
 	case MODEM_CMUX_RECEIVE_STATE_SOF:
 		if (byte == 0xF9) {
-			cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_ADDRESS;
+			cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_RESYNC;
 			break;
 		}
 
-		modem_cmux_transmit_resync(cmux);
-		cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_RESYNC_0;
-		break;
-
-	case MODEM_CMUX_RECEIVE_STATE_RESYNC_0:
-		if (byte == 0xF9) {
-			cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_RESYNC_1;
-		}
-
-		break;
-
-	case MODEM_CMUX_RECEIVE_STATE_RESYNC_1:
-		if (byte == 0xF9) {
-			cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_RESYNC_2;
-		} else {
-			modem_cmux_transmit_resync(cmux);
-			cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_RESYNC_0;
-		}
-
 		break;
 
-	case MODEM_CMUX_RECEIVE_STATE_RESYNC_2:
-		if (byte == 0xF9) {
-			cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_RESYNC_3;
-		} else {
-			modem_cmux_transmit_resync(cmux);
-			cmux->receive_state = MODEM_CMUX_RECEIVE_STATE_RESYNC_0;
-		}
-
-		break;
-
-	case MODEM_CMUX_RECEIVE_STATE_RESYNC_3:
+	case MODEM_CMUX_RECEIVE_STATE_RESYNC:
+		/*
+		 * Allow any number of consequtive flags (0xF9).
+		 * 0xF9 could also be a valid address field for DLCI 62.
+		 */
 		if (byte == 0xF9) {
 			break;
 		}
 
+		__fallthrough;
+
 	case MODEM_CMUX_RECEIVE_STATE_ADDRESS:
 		/* Initialize */
 		cmux->receive_buf_len = 0;