bsc: improve TC_assignment_csd

Verify that CSD ipaccess CRCX/MDCX has the CSD RTP payload type, and
that the RSL_IE_IPAC_RTP_CSD_FMT IE is set with
RSL_IPA_RTP_CSD_TRAU_BTS.

Related: OS#4393
Change-Id: Id0e0c5631d7a36635e1ef49cf5bf554f0336556b
diff --git a/library/MGCP_Types.ttcn b/library/MGCP_Types.ttcn
index 01d4d3a..da1b7f6 100644
--- a/library/MGCP_Types.ttcn
+++ b/library/MGCP_Types.ttcn
@@ -128,7 +128,8 @@
 		PT_GSMEFR(110),
 		PT_GSMHR(111),
 		PT_AMR(112),
-		PT_AMRWB(113)
+		PT_AMRWB(113),
+		PT_CSD(120)
 	}
 
 } with { encode "TEXT" }