msc: add sdp to MNCC

SDP is added to the MNCC protocol in osmo-msc
Ie16f0804c4d99760cd4a0c544d0889b6313eebb7.
This patch adds SDP to the ttcn3 MNCC messaging.

These changes still work with current osmo-msc master that doesn't send SDP /
ignores received SDP in MNCC.

Change-Id: Ic9568c8927507e161aadfad1a4d20aa896d8ae30
diff --git a/library/MNCC_EncDec.cc b/library/MNCC_EncDec.cc
index b4937e7..f2692d7 100644
--- a/library/MNCC_EncDec.cc
+++ b/library/MNCC_EncDec.cc
@@ -259,7 +259,7 @@
 	case MNCC_RTP_FREE:
 		in_rtp = (const struct gsm_mncc_rtp *) in_mncc;
 		rtp = MNCC__PDU__Rtp(in_rtp->callref, in_rtp->ip, in_rtp->port, in_rtp->payload_type,
-				     in_rtp->payload_msg_type);
+				     in_rtp->payload_msg_type, in_rtp->sdp);
 		u.rtp() = rtp;
 		break;
 	default:
@@ -315,6 +315,7 @@
 		sign.imsi() = CHARSTRING(in_mncc->imsi);
 		sign.lchan__type() = in_mncc->lchan_type;
 		sign.lchan__mode() = in_mncc->lchan_mode;
+		sign.sdp() = in_mncc->sdp;
 		u.signal() = sign;
 		break;
 	}