--- switch_rtp.c    2024-06-22 15:48:16.879125840 +0000
+++ switch_rtp.c    2024-06-22 15:50:05.055559774 +0000
@@ -8904,6 +8904,7 @@
                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;
        }
 
        /*