mgcp_client: add new codec IUFP as VND.3GPP.IUFP

3GPP TS 25.414 5.1.3.3.1.6 specifies that IuUP can use RTP as transport.
The payload type is specified from 96-127, which shall be ignored on the
receiving end anyway.

The payload type number we use shall be 96 by default.

Change-Id: Ifd1210a897743396899f34457c96e6fd2109c6b3
Related: SYS#5152

include/osmocom/mgcp_client/mgcp_client.h

@@ -49,6 +49,7 @@ enum mgcp_codecs {
 	CODEC_GSMHR_8000_1 = 111,
 	CODEC_AMR_8000_1 = 112,
 	CODEC_AMRWB_16000_1 = 113,
+	CODEC_IUFP = 96,
 };
 /* Note: when new codec types are added, the corresponding value strings
  * in mgcp_client.c (codec_table) must be updated as well. Enumerations

src/libosmo-mgcp-client/mgcp_client.c

@@ -59,6 +59,7 @@ const struct value_string osmo_mgcpc_codec_names[] = {
 	{ CODEC_GSMHR_8000_1, "GSM-HR-08/8000/1" },
 	{ CODEC_AMR_8000_1, "AMR/8000/1" },
 	{ CODEC_AMRWB_16000_1, "AMR-WB/16000/1" },
+	{ CODEC_IUFP, "VND.3GPP.IUFP/16000" },
 	{ 0, NULL },
 };