Make group calls respect the ICE fallback setting (#11047)

src/models/Call.ts

@@ -659,6 +659,8 @@ export class ElementCall extends Call {
             analyticsID,
         });
 
+        if (SettingsStore.getValue("fallbackICEServerAllowed")) params.append("allowIceFallback", "");
+
         // Set custom fonts
         if (SettingsStore.getValue("useSystemFont")) {
             SettingsStore.getValue<string>("systemFont")

test/models/Call-test.ts

@@ -625,6 +625,36 @@ describe("ElementCall", () => {
             SettingsStore.getValue = originalGetValue;
         });
 
+        it("passes ICE fallback preference through widget URL", async () => {
+            // Test with the preference set to false
+            await ElementCall.create(room);
+            const call1 = Call.get(room);
+            if (!(call1 instanceof ElementCall)) throw new Error("Failed to create call");
+
+            const urlParams1 = new URLSearchParams(new URL(call1.widget.url).hash.slice(1));
+            expect(urlParams1.has("allowIceFallback")).toBe(false);
+
+            // Now test with the preference set to true
+            const originalGetValue = SettingsStore.getValue;
+            SettingsStore.getValue = <T>(name: string, roomId?: string, excludeDefault?: boolean) => {
+                switch (name) {
+                    case "fallbackICEServerAllowed":
+                        return true as T;
+                    default:
+                        return originalGetValue<T>(name, roomId, excludeDefault);
+                }
+            };
+
+            await ElementCall.create(room);
+            const call2 = Call.get(room);
+            if (!(call2 instanceof ElementCall)) throw new Error("Failed to create call");
+
+            const urlParams2 = new URLSearchParams(new URL(call2.widget.url).hash.slice(1));
+            expect(urlParams2.has("allowIceFallback")).toBe(true);
+
+            SettingsStore.getValue = originalGetValue;
+        });
+
         it("passes analyticsID through widget URL", async () => {
             client.getAccountData.mockImplementation((eventType: string) => {
                 if (eventType === PosthogAnalytics.ANALYTICS_EVENT_TYPE) {