diff --git a/include/osmocom/msc/codec_mapping.h b/include/osmocom/msc/codec_mapping.h
new file mode 100644
index 0000000..1232d2d
--- /dev/null
+++ b/include/osmocom/msc/codec_mapping.h
@@ -0,0 +1,64 @@
+/* Routines for translation between codec representations: SDP, CC/BSSMAP variants, MGCP, MNCC */
+#pragma once
+
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/protocol/gsm_08_08.h>
+#include <osmocom/mgcp_client/mgcp_client.h>
+#include <osmocom/msc/sdp_msg.h>
+#include <osmocom/gsm/mncc.h>
+
+#define NO_MGCP_CODEC 0xffffffff
+
+extern const struct gsm_mncc_bearer_cap bearer_cap_empty;
+
+enum codec_frhr {
+	CODEC_FRHR_NONE = 0,
+	CODEC_FRHR_FR,
+	CODEC_FRHR_HR,
+};
+
+struct codec_mapping {
+	/* The sdp.payload_type number in a mapping is not necessarily imperative, but may just reflect the usual
+	 * payload type number for a given codec. */
+	struct sdp_audio_codec sdp;
+	/* The id that mgcp_client.h uses for this codec. Must be set in each mapping, because 0 means PCMU. */
+	enum mgcp_codecs mgcp;
+	/* Nr of used entries in speech_ver[] below. */
+	unsigned int speech_ver_count;
+	/* Entries to add to Speech Version lists when this codec is present, if any. */
+	enum gsm48_bcap_speech_ver speech_ver[8];
+	/* If applicable, one of GSM_TCHF_FRAME, GSM_TCHF_FRAME_EFR, GSM_TCHH_FRAME, GSM_TCH_FRAME_AMR; or zero. */
+	uint32_t mncc_payload_msg_type;
+	/* Set to true if gsm0808_speech_codec below reflects a meaningful value. */
+	bool has_gsm0808_speech_codec;
+	struct gsm0808_speech_codec gsm0808_speech_codec;
+	/* If applicable, entries to add to Permitted Speech lists when this codec is present; or zero. */
+	enum gsm0808_permitted_speech perm_speech;
+	/* If applicable, indicator whether this codec can work on a GERAN half-rate lchan, or whether full-rate is
+	 * required. Leave zero when this codec does not apply to GERAN. */
+	enum codec_frhr frhr;
+};
+
+const struct codec_mapping *codec_mapping_by_speech_ver(enum gsm48_bcap_speech_ver speech_ver);
+const struct codec_mapping *codec_mapping_by_gsm0808_speech_codec_type(enum gsm0808_speech_codec_type sct);
+const struct codec_mapping *codec_mapping_by_gsm0808_speech_codec(const struct gsm0808_speech_codec *sc);
+const struct codec_mapping *codec_mapping_by_perm_speech(enum gsm0808_permitted_speech perm_speech);
+const struct codec_mapping *codec_mapping_by_subtype_name(const char *subtype_name);
+const struct codec_mapping *codec_mapping_by_mgcp_codec(enum mgcp_codecs mgcp);
+
+int bearer_cap_add_speech_ver(struct gsm_mncc_bearer_cap *bearer_cap, enum gsm48_bcap_speech_ver speech_ver);
+int sdp_audio_codec_add_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codec *codec);
+int sdp_audio_codecs_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codecs *ac);
+int bearer_cap_set_radio(struct gsm_mncc_bearer_cap *bearer_cap);
+
+struct sdp_audio_codec *sdp_audio_codecs_add_speech_ver(struct sdp_audio_codecs *ac,
+							enum gsm48_bcap_speech_ver speech_ver);
+struct sdp_audio_codec *sdp_audio_codecs_add_mgcp_codec(struct sdp_audio_codecs *ac, enum mgcp_codecs mgcp_codec);
+void sdp_audio_codecs_from_bearer_cap(struct sdp_audio_codecs *ac, const struct gsm_mncc_bearer_cap *bc);
+
+void sdp_audio_codecs_to_speech_codec_list(struct gsm0808_speech_codec_list *cl, const struct sdp_audio_codecs *ac);
+void sdp_audio_codecs_from_speech_codec_list(struct sdp_audio_codecs *ac, const struct gsm0808_speech_codec_list *cl);
+
+int sdp_audio_codecs_to_gsm0808_channel_type(struct gsm0808_channel_type *ct, const struct sdp_audio_codecs *ac);
+
+enum mgcp_codecs sdp_audio_codec_to_mgcp_codec(const struct sdp_audio_codec *codec);