library/L1CTL_Types: use traffic forwarding mode by default

Calypso PHY (unlike trxcon) needs to be explicitly configured to
enable forwarding of the TCH traffic.  Otherwise it's handled
internally by the DSP and routed to/from the built-in speaker/mic.

Change-Id: I5b9ca5683627716868e85dc33f91d8ca4824cd61
Related: OS#4799
diff --git a/library/L1CTL_Types.ttcn b/library/L1CTL_Types.ttcn
index 7e7c9cf..03ec23f 100644
--- a/library/L1CTL_Types.ttcn
+++ b/library/L1CTL_Types.ttcn
@@ -169,6 +169,13 @@
 
 	template (value) L1ctlAudioMode t_L1CTL_AudioModeNone := { '0000'B, false, false, false, false };
 
+	/* Traffic forwarding mode (see TRAFFIC.{req,cnf,ind} messages) */
+	template (value) L1ctlAudioMode t_L1CTL_AudioModeFwd
+	modifies t_L1CTL_AudioModeNone := {
+		tx_traffic_req := true,
+		rx_traffic_ind := true
+	};
+
 	type record L1ctlTchModeConf {
 		L1ctlTchMode	tch_mode,
 		L1ctlAudioMode	audio_mode,
@@ -517,7 +524,7 @@
 
 	template (value) L1ctlUlMessage
 	ts_L1CTL_TCH_MODE_REQ(template (value) L1ctlTchMode tch_mode := L1CTL_CHAN_MODE_SIGN,
-			      template (value) L1ctlAudioMode audio_mode := t_L1CTL_AudioModeNone,
+			      template (value) L1ctlAudioMode audio_mode := t_L1CTL_AudioModeFwd,
 			      template (value) L1ctlLoopMode loop_mode := L1CTL_LOOP_MODE_OPEN) := {
 		header := ts_L1ctlHeader(L1CTL_TCH_MODE_REQ),
 		ul_info := omit,
@@ -618,7 +625,7 @@
 			dm_est_req := {
 				tsc := tsc,
 				tch_mode := L1CTL_CHAN_MODE_SIGN,
-				audio_mode := t_L1CTL_AudioModeNone
+				audio_mode := t_L1CTL_AudioModeFwd
 			}
 		}
 	}