diff --git a/include/osmocom/sgsn/gprs_gmm.h b/include/osmocom/sgsn/gprs_gmm.h
new file mode 100644
index 0000000..6324c5d
--- /dev/null
+++ b/include/osmocom/sgsn/gprs_gmm.h
@@ -0,0 +1,35 @@
+#ifndef _GPRS_GMM_H
+#define _GPRS_GMM_H
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/sgsn/gprs_sgsn.h>
+
+#include <stdbool.h>
+
+int gsm48_tx_gsm_deact_pdp_req(struct sgsn_pdp_ctx *pdp, uint8_t sm_cause);
+int gsm48_tx_gsm_act_pdp_rej(struct sgsn_mm_ctx *mm, uint8_t tid,
+			     uint8_t cause, uint8_t pco_len, uint8_t *pco_v);
+int gsm48_tx_gsm_act_pdp_acc(struct sgsn_pdp_ctx *pdp);
+int gsm48_tx_gsm_deact_pdp_acc(struct sgsn_pdp_ctx *pdp);
+
+int gsm0408_gprs_rcvmsg_gb(struct msgb *msg, struct gprs_llc_llme *llme,
+			   bool drop_cipherable);
+int gsm0408_gprs_rcvmsg_iu(struct msgb *msg, struct gprs_ra_id *ra_id,
+			   uint16_t *sai);
+int gsm0408_gprs_force_reattach(struct sgsn_mm_ctx *mmctx);
+int gsm0408_gprs_force_reattach_oldmsg(struct msgb *msg,
+				       struct gprs_llc_llme *llme);
+void gsm0408_gprs_access_granted(struct sgsn_mm_ctx *mmctx);
+void gsm0408_gprs_access_denied(struct sgsn_mm_ctx *mmctx, int gmm_cause);
+void gsm0408_gprs_access_cancelled(struct sgsn_mm_ctx *mmctx, int gmm_cause);
+void gsm0408_gprs_authenticate(struct sgsn_mm_ctx *mmctx);
+
+int gprs_gmm_rx_suspend(struct gprs_ra_id *raid, uint32_t tlli);
+int gprs_gmm_rx_resume(struct gprs_ra_id *raid, uint32_t tlli,
+		       uint8_t suspend_ref);
+
+time_t gprs_max_time_to_idle(void);
+
+int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp);
+
+#endif /* _GPRS_GMM_H */