Add initial CSD support with external MNCC
Implement and use CSD bearer service logic (with similar audio codec code):
* csd_filter (codec_filter)
* csd_bs (sdp_audio_codec)
* csd_bs_list (sdp_audio_codecs)
Related: OS#4394
Change-Id: Ide8b8321e0401dcbe35da2ec9cee0abca821d99a
diff --git a/include/osmocom/msc/transaction.h b/include/osmocom/msc/transaction.h
index 36aab78..d2a463d 100644
--- a/include/osmocom/msc/transaction.h
+++ b/include/osmocom/msc/transaction.h
@@ -9,6 +9,7 @@
#include <osmocom/msc/msc_a.h>
#include <osmocom/msc/debug.h>
#include <osmocom/msc/codec_filter.h>
+#include <osmocom/msc/csd_filter.h>
#include <osmocom/gsm/gsm0411_smc.h>
#include <osmocom/gsm/gsm0411_smr.h>
@@ -107,8 +108,9 @@
struct osmo_lcls *lcls;
/* SDP as last received from the remote call leg. */
struct sdp_msg remote;
- /* Track codec choices from BSS and remote call leg */
+ /* Track codec/CSD choices from BSS and remote call leg */
struct codec_filter codecs;
+ struct csd_filter csd;
/* Resulting choice from codecs/bearer services and the
* local RTP address to be sent to the remote call leg. */
struct sdp_msg local;