diff --git a/src/sdp/sdp.h b/src/sdp/sdp.h
new file mode 100644
index 0000000..f0588d1
--- /dev/null
+++ b/src/sdp/sdp.h
@@ -0,0 +1,87 @@
+/**
+ * @file sdp.h  Internal SDP interface
+ *
+ * Copyright (C) 2010 Creytiv.com
+ */
+
+
+enum {
+	RTP_DYNPT_START =  96,
+	RTP_DYNPT_END   = 127,
+};
+
+
+struct sdp_session {
+	struct list lmedial;
+	struct list medial;
+	struct list lattrl;
+	struct list rattrl;
+	struct sa laddr;
+	struct sa raddr;
+	int32_t lbwv[SDP_BANDWIDTH_MAX];
+	int32_t rbwv[SDP_BANDWIDTH_MAX];
+	uint32_t id;
+	uint32_t ver;
+	enum sdp_dir rdir;
+};
+
+struct sdp_media {
+	struct le le;
+	struct list lfmtl;
+	struct list rfmtl;
+	struct list lattrl;
+	struct list rattrl;
+	struct sa laddr;
+	struct sa raddr;
+	struct sa laddr_rtcp;
+	struct sa raddr_rtcp;
+	int32_t lbwv[SDP_BANDWIDTH_MAX];
+	int32_t rbwv[SDP_BANDWIDTH_MAX];
+	char *name;
+	char *proto;
+	char *protov[8];
+	char *uproto;           /* unsupported protocol */
+	sdp_media_enc_h *ench;
+	void *arg;
+	enum sdp_dir ldir;
+	enum sdp_dir rdir;
+	bool fmt_ignore;
+	bool disabled;
+	int dynpt;
+};
+
+
+/* session */
+void sdp_session_rreset(struct sdp_session *sess);
+
+
+/* media */
+int  sdp_media_radd(struct sdp_media **mp, struct sdp_session *sess,
+		    const struct pl *name, const struct pl *proto);
+void sdp_media_rreset(struct sdp_media *m);
+bool sdp_media_proto_cmp(struct sdp_media *m, const struct pl *proto,
+			 bool update);
+struct sdp_media *sdp_media_find(const struct sdp_session *sess,
+				 const struct pl *name,
+				 const struct pl *proto,
+				 bool update_proto);
+void sdp_media_align_formats(struct sdp_media *m, bool offer);
+
+
+/* format */
+int  sdp_format_radd(struct sdp_media *m, const struct pl *id);
+struct sdp_format *sdp_format_find(const struct list *lst,
+				   const struct pl *id);
+
+
+/* attribute */
+struct sdp_attr;
+
+int  sdp_attr_add(struct list *lst, struct pl *name, struct pl *val);
+int  sdp_attr_addv(struct list *lst, const char *name, const char *val,
+		   va_list ap);
+void sdp_attr_del(const struct list *lst, const char *name);
+const char *sdp_attr_apply(const struct list *lst, const char *name,
+			   sdp_attr_h *attrh, void *arg);
+int sdp_attr_print(struct re_printf *pf, const struct sdp_attr *attr);
+int sdp_attr_debug(struct re_printf *pf, const struct sdp_attr *attr);