diff --git a/deploy/truenas/core/docker-compose.yml b/deploy/truenas/core/docker-compose.yml
index 47a2136..6673a5e 100644
--- a/deploy/truenas/core/docker-compose.yml
+++ b/deploy/truenas/core/docker-compose.yml
@@ -42,6 +42,17 @@ services:
       # Leave NAT1To1_IPS empty unless you need multiple advertised IPs.
       # CORE_WEBRTC_NAT_1_TO_1_IPS: "10.0.0.25 203.0.113.10"
 
+      # --- RTMP / RTMPS / SRT / TLS port overrides ---
+      # Default Datarhei ports (1935, 1936, 6000, 8181) are common
+      # and frequently collide with an existing upstream datarhei/
+      # restreamer container or other RTMP servers on the same host.
+      # Pull these out of .env so operators can remap without editing
+      # this file. Empty strings keep the upstream defaults.
+      CORE_RTMP_ADDRESS: "${CORE_RTMP_ADDRESS:-:1935}"
+      CORE_RTMP_ADDRESS_TLS: "${CORE_RTMP_ADDRESS_TLS:-:1936}"
+      CORE_SRT_ADDRESS: "${CORE_SRT_ADDRESS:-:6000}"
+      CORE_TLS_ADDRESS: "${CORE_TLS_ADDRESS:-:8181}"
+
       # --- Storage ---
       # Let the volumes below provide durable paths; defaults are fine.