diff --git a/.changeset/phonic-client-header.md b/.changeset/phonic-client-header.md
new file mode 100644
index 000000000..e2202281c
--- /dev/null
+++ b/.changeset/phonic-client-header.md
@@ -0,0 +1,5 @@
+---
+'@livekit/agents-plugin-phonic': patch
+---
+
+Add LiveKit Agents JS client header to Phonic conversation sockets.
diff --git a/plugins/phonic/src/realtime/realtime_model.ts b/plugins/phonic/src/realtime/realtime_model.ts
index 0ebf6a825..ada896966 100644
--- a/plugins/phonic/src/realtime/realtime_model.ts
+++ b/plugins/phonic/src/realtime/realtime_model.ts
@@ -573,6 +573,7 @@ export class RealtimeSession extends llm.RealtimeSession {
 
   private async connect(): Promise<void> {
     this.socket = await this.client.conversations.connect({
+      headers: { 'x-phonic-client': 'livekit-agents-js' },
       reconnectAttempts: this.options.connOptions.maxRetry,
     });