diff --git a/android/app/src/main/java/com/fabledsword/minstrel/player/output/upnp/AVTransportClient.kt b/android/app/src/main/java/com/fabledsword/minstrel/player/output/upnp/AVTransportClient.kt
index 61e2a2ad..11dbbe58 100644
--- a/android/app/src/main/java/com/fabledsword/minstrel/player/output/upnp/AVTransportClient.kt
+++ b/android/app/src/main/java/com/fabledsword/minstrel/player/output/upnp/AVTransportClient.kt
@@ -204,22 +204,29 @@ class AVTransportClient(
     }
 
     private fun buildDidlLite(uri: String, mime: String, title: String): String {
-        // Sonos firmware accepts boolean-style restricted ("true"/"false") only
-        // and rejects "1"/"0" silently; if it can't parse our DIDL it regenerates
-        // its own with generic class object.item, no title, and the URL query
-        // string as the displayed name (logcat 2026-06-04 confirmed). Match the
-        // SoCo convention which the firmware definitely accepts.
+        // Sonos requires (a) the rinconnetworks namespace declared on
+        // <DIDL-Lite> even if we don't use Rincon elements directly, and
+        // (b) a <desc id="cdudn"> element identifying the URI as an
+        // external (non-Sonos-library) source. Without those, Sonos
+        // discards our metadata content and regenerates its own with
+        // class=object.item and the URL query string as the title
+        // (logcat 2026-06-04 confirmed). Match SoCo's pattern.
         val safeTitle = title.ifBlank { "Minstrel" }
         return buildString {
             append("<DIDL-Lite ")
             append("xmlns=\"urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/\" ")
             append("xmlns:dc=\"http://purl.org/dc/elements/1.1/\" ")
-            append("xmlns:upnp=\"urn:schemas-upnp-org:metadata-1-0/upnp/\">")
+            append("xmlns:upnp=\"urn:schemas-upnp-org:metadata-1-0/upnp/\" ")
+            append("xmlns:r=\"urn:schemas-rinconnetworks-com:metadata-1-0/\">")
             append("<item id=\"-1\" parentID=\"-1\" restricted=\"true\">")
             append("<dc:title>").append(xmlEscape(safeTitle)).append("</dc:title>")
             append("<upnp:class>object.item.audioItem.musicTrack</upnp:class>")
             append("<res protocolInfo=\"http-get:*:").append(xmlEscape(mime))
             append(":*\">").append(xmlEscape(uri)).append("</res>")
+            append("<desc id=\"cdudn\" ")
+            append("nameSpace=\"urn:schemas-rinconnetworks-com:metadata-1-0/\">")
+            append("RINCON_AssociatedZPUDN")
+            append("</desc>")
             append("</item>")
             append("</DIDL-Lite>")
         }