diff --git a/include/osmocom/codec/codec.h b/include/osmocom/codec/codec.h
index d126e0f..b7bcc78 100644
--- a/include/osmocom/codec/codec.h
+++ b/include/osmocom/codec/codec.h
@@ -2,6 +2,8 @@
 
 #include <stdint.h>
 
+#include <osmocom/core/utils.h>
+
 extern const uint16_t gsm610_bitorder[];	/* FR */
 extern const uint16_t gsm620_unvoiced_bitorder[]; /* HR unvoiced */
 extern const uint16_t gsm620_voiced_bitorder[];   /* HR voiced */
@@ -15,3 +17,32 @@
 extern const uint16_t gsm690_5_9_bitorder[];	/* AMR  5.9  kbits */
 extern const uint16_t gsm690_5_15_bitorder[];	/* AMR  5.15 kbits */
 extern const uint16_t gsm690_4_75_bitorder[];	/* AMR  4.75 kbits */
+
+extern const struct value_string osmo_amr_type_names[];
+
+enum osmo_amr_type {
+       AMR_4_75 = 0,
+       AMR_5_15 = 1,
+       AMR_5_90 = 2,
+       AMR_6_70 = 3,
+       AMR_7_40 = 4,
+       AMR_7_95 = 5,
+       AMR_10_2 = 6,
+       AMR_12_2 = 7,
+       AMR_SID = 8,
+       AMR_GSM_EFR_SID = 9,
+       AMR_TDMA_EFR_SID = 10,
+       AMR_PDC_EFR_SID = 11,
+       AMR_NO_DATA = 15,
+};
+
+enum osmo_amr_quality {
+       AMR_BAD = 0,
+       AMR_GOOD = 1
+};
+
+int osmo_amr_rtp_enc(uint8_t *payload, uint8_t cmr, enum osmo_amr_type ft,
+		     enum osmo_amr_quality bfi);
+int osmo_amr_rtp_dec(const uint8_t *payload, int payload_len, uint8_t *cmr,
+		     int8_t *cmi, enum osmo_amr_type *ft,
+		     enum osmo_amr_quality *bfi, int8_t *sti);