mgcp: Handle SDP in CRCX received by the MGW

So far the SDP part of the CRCX message has been ignored by the MGW.

This patch adds SDP parsing for this case, eventually updating the
net end's payload type and connection parameters.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/tests/mgcp/mgcp_test.c b/openbsc/tests/mgcp/mgcp_test.c
index 0aebb4c..c58f52d 100644
--- a/openbsc/tests/mgcp/mgcp_test.c
+++ b/openbsc/tests/mgcp/mgcp_test.c
@@ -182,11 +182,11 @@
 	{ "AUEP2", AUEP2, AUEP2_RET },
 	{ "MDCX1", MDCX_WRONG_EP, MDCX_ERR_RET },
 	{ "MDCX2", MDCX_UNALLOCATED, MDCX_RET },
-	{ "CRCX", CRCX, CRCX_RET, PTYPE_NYI, 126 },
+	{ "CRCX", CRCX, CRCX_RET, 97, 126 },
 	{ "MDCX3", MDCX3, MDCX3_RET, PTYPE_NONE, 126 },
 	{ "MDCX4", MDCX4, MDCX4_RET, 99, 126 },
 	{ "DLCX", DLCX, DLCX_RET, -1, -1 },
-	{ "CRCX_ZYN", CRCX_ZYN, CRCX_ZYN_RET, PTYPE_NYI, 126 },
+	{ "CRCX_ZYN", CRCX_ZYN, CRCX_ZYN_RET, 97, 126 },
 	{ "EMPTY", EMPTY, EMPTY_RET },
 	{ "SHORT1", SHORT, SHORT_RET },
 	{ "SHORT2", SHORT2, SHORT2_RET },