--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/rtp_defs.h	Fri Mar 17 01:14:57 2023 -0800
@@ -0,0 +1,19 @@
+/*
+ * This header file holds some definitions for RTP, as this protocol
+ * functions in our GSM and PSTN environment.
+ */
+
+#define	RTP_PACKET_SIZE_PSTN	172
+#define	RTP_PACKET_SIZE_GSM_FR	45
+#define	RTP_PACKET_SIZE_GSM_EFR	43
+#define	RTP_PACKET_SIZE_BFI	14
+#define	RTP_MAX_PAYLOAD		160
+
+struct rtp_packet {
+	uint8_t		v_p_x_cc;
+	uint8_t		m_pt;
+	uint16_t	seq;
+	uint32_t	tstamp;
+	uint32_t	ssrc;
+	uint8_t		payload[RTP_MAX_PAYLOAD];
+};