ran_msg_iu.c: Set proper codec in Assignment Complete

We need to set the codec as present in order for
msc_a_up_call_assignment_complete() to configure properly the CN-side of
he leg with the IUFP codec, which should be the desired default in order
to avoid transcoding.

Change-Id: Ib8086462239e2df748cf47ea7b37a07f1f3b85a8

src/libmsc/ran_msg_iu.c

@@ -153,7 +153,8 @@ static int ran_iu_decode_rab_assignment_response_decode_setup_ies(struct ran_dec
 		.msg_type = RAN_MSG_ASSIGNMENT_COMPLETE,
 		.msg_name = "RANAP RAB Assignment Response",
 		.assignment_complete = {
-			.codec = CODEC_AMR_8000_1,
+			.codec_present = true,
+			.codec = CODEC_IUFP,
 		},
 	};
 	if (osmo_sockaddr_str_from_str(&ran_dec_msg->assignment_complete.remote_rtp, addr, port)) {