FS-11230: [core] Fix bad rtp timestamps triggered by cng/missed packet detection

src/switch_rtp.c

@@ -8166,7 +8166,7 @@ static int rtp_common_write(switch_rtp_t *rtp_session,
 #ifdef DEBUG_TS_ROLLOVER
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "WRITE TS LAST:%u THIS:%u DELTA:%u\n", rtp_session->last_write_ts, this_ts, ts_delta);
 #endif
-		if (!switch_rtp_ready(rtp_session) || rtp_session->sending_dtmf) {
+		if (ts_delta == 0 || !switch_rtp_ready(rtp_session) || rtp_session->sending_dtmf) {
 			send = 0;
 		}
 	}
@@ -8684,6 +8684,7 @@ SWITCH_DECLARE(int) switch_rtp_write_frame(switch_rtp_t *rtp_session, switch_fra
 		data = frame->data;
 		len = frame->datalen;
 		ts = rtp_session->flags[SWITCH_RTP_FLAG_RAW_WRITE] ? (uint32_t) frame->timestamp : 0;
+		if (!ts) ts = rtp_session->last_write_ts + rtp_session->samples_per_interval;
 	}
 
 	/*