diff --git a/include/osmocom/gsm/l1sap.h b/include/osmocom/gsm/l1sap.h
index 1af8ba846..ad942eae6 100644
--- a/include/osmocom/gsm/l1sap.h
+++ b/include/osmocom/gsm/l1sap.h
@@ -14,6 +14,8 @@ enum osmo_ph_prim {
 	PRIM_TCH_RTS,		/*!< \brief TCH */
 };
 
+extern const struct value_string osmo_ph_prim_names[];
+
 /*! \brief PH-SAP related primitives (L1<->L2 SAP) */
 enum osmo_mph_info_type {
 	PRIM_INFO_TIME,		/*!< \brief Current GSM time */
diff --git a/src/gsm/lapdm.c b/src/gsm/lapdm.c
index d44335fe7..fa7769b20 100644
--- a/src/gsm/lapdm.c
+++ b/src/gsm/lapdm.c
@@ -111,6 +111,18 @@ enum lapdm_format {
 	LAPDm_FMT_B4,
 };
 
+const struct value_string osmo_ph_prim_names[] = {
+	{ PRIM_PH_DATA,		"PH-DATA" },
+	{ PRIM_PH_RACH,		"PH-RANDOM_ACCESS" },
+	{ PRIM_PH_CONN,		"PH-CONNECT" },
+	{ PRIM_PH_EMPTY_FRAME,	"PH-EMPTY_FRAME" },
+	{ PRIM_PH_RTS,		"PH-RTS" },
+	{ PRIM_MPH_INFO,	"MPH-INFO" },
+	{ PRIM_TCH,		"TCH" },
+	{ PRIM_TCH_RTS,		"TCH-RTS" },
+	{ 0,			NULL }
+};
+
 static int lapdm_send_ph_data_req(struct lapd_msg_ctx *lctx, struct msgb *msg);
 static int send_rslms_dlsap(struct osmo_dlsap_prim *dp,
 	struct lapd_msg_ctx *lctx);
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 1e2d3238b..301f5aa1b 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -223,6 +223,8 @@ lapdm_phsap_dequeue_prim;
 lapdm_phsap_up;
 lapdm_rslms_recvmsg;
 
+osmo_ph_prim_names;
+
 milenage_auts;
 milenage_check;
 milenage_f1;