feat: add autoOpenEgressGate to RtcOptions and pass via setMediaPreferences

Defaults to true. When true the gateway immediately re-opens the egress gate
after each call ends, so the next call's audio flows without any round-trip
delay. Pass false to restore legacy behaviour (gate stays closed until
streamAvailable is processed by the gateway).

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: smoghe-bw

src/types.ts

@@ -35,6 +35,13 @@ export interface RtcOptions {
   websocketUrl?: string;
   iceServers?: RTCIceServer[];
   iceTransportPolicy?: RTCIceTransportPolicy;
+  /**
+   * When true (default), the gateway re-opens the egress gate immediately after
+   * each call ends so the next call's audio flows without any round-trip delay.
+   * Set to false to restore the legacy behaviour where the gate stays closed
+   * between calls until the gateway processes streamAvailable.
+   */
+  autoOpenEgressGate?: boolean;
 }
 
 export interface RtcStream {

src/v1/signaling.ts

@@ -15,6 +15,7 @@ class Signaling extends EventEmitter {
   private isReady: boolean = false;
   private readyMetadata: ReadyMetadata | null = null;
   private diagnosticsBatcher?: DiagnosticsBatcher;
+  private rtcOptions?: RtcOptions;
 
   constructor(diagnosticsBatcher?: DiagnosticsBatcher) {
     super();
@@ -35,6 +36,7 @@ class Signaling extends EventEmitter {
       if (options) {
         rtcOptions = { ...rtcOptions, ...options };
       }
+      this.rtcOptions = rtcOptions;
       const websocketUrl = `${rtcOptions.websocketUrl}?client=node&sdkVersion=${sdkVersion}&uniqueId=${this.uniqueDeviceId}&endpointToken=${authParams.endpointToken}`;
       logger.debug(`Connecting to ${websocketUrl}`);
       console.log(`Connecting to ${websocketUrl}`);
@@ -122,9 +124,11 @@ class Signaling extends EventEmitter {
   }
 
   private setMediaPreferences(): Promise<{}> {
-    logger.debug(`Calling "setMediaPreferences"`, { protocol: "WEBRTC" });
+    const autoOpenEgressGate = this.rtcOptions?.autoOpenEgressGate ?? true;
+    logger.debug(`Calling "setMediaPreferences"`, { protocol: "WEBRTC", autoOpenEgressGate });
     return this.ws?.call("setMediaPreferences", {
       protocol: "WEBRTC",
+      autoOpenEgressGate,
     }) as Promise<SetMediaPreferencesWebRtcResponse>;
   }