diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h
index b510644..cb53e0c 100644
--- a/include/osmocom/gsm/gsm0808_utils.h
+++ b/include/osmocom/gsm/gsm0808_utils.h
@@ -73,3 +73,5 @@
 			     const uint8_t *elem, uint8_t len);
 
 int gsm0808_chan_type_to_speech_code(uint8_t perm_spch);
+int gsm0808_speech_codec_from_chan_type(struct gsm0808_speech_codec *sc,
+					uint8_t perm_spch);