--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sip-manual-out/rtp.c	Thu Mar 16 23:46:17 2023 -0800
@@ -0,0 +1,58 @@
+/*
+ * In this module we implement our RTP handling: obtaining a PSTN-side
+ * RTP endpoint from themwi-rtp-mgr, then handling read select on RTP
+ * and RTCP UDP sockets.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "../include/tmgw_const.h"
+#include "../librtpalloc/rtp_alloc_simple.h"
+
+struct sockaddr_in rtp_local_addr;
+int rtp_udp_fd, rtcp_udp_fd;
+
+static int got_some_rtp, got_some_rtcp;
+
+void
+obtain_rtp_endp()
+{
+	int rc;
+	struct rtp_alloc_simple res;
+
+	rc = rtp_alloc_simple(TMGW_EP_TYPE_PSTN_ONLY, &res);
+	if (rc < 0)
+		exit(1);	/* error msg already printed */
+	bcopy(&res.pstn_addr, &rtp_local_addr, sizeof(struct sockaddr_in));
+	rtp_udp_fd = res.pstn_rtp_fd;
+	rtcp_udp_fd = res.pstn_rtcp_fd;
+}
+
+void
+rtp_rx_select()
+{
+	u_char buf[512];
+
+	recv(rtp_udp_fd, buf, sizeof buf, 0);
+	if (!got_some_rtp) {
+		printf("Got some RTP\n");
+		got_some_rtp = 1;
+	}
+}
+
+void
+rtcp_rx_select()
+{
+	u_char buf[512];
+
+	recv(rtcp_udp_fd, buf, sizeof buf, 0);
+	if (!got_some_rtcp) {
+		printf("Got some RTCP\n");
+		got_some_rtcp = 1;
+	}
+}