diff --git a/packages/@webex/plugin-cc/src/config.ts b/packages/@webex/plugin-cc/src/config.ts
index 49fc9e6d461..b9be0610a10 100644
--- a/packages/@webex/plugin-cc/src/config.ts
+++ b/packages/@webex/plugin-cc/src/config.ts
@@ -17,7 +17,7 @@ export default {
       },
       serviceData: {
         indicator: 'contactcenter',
-        // TODO: This should be dynamic based on the environment
+        // This is now being read dynamically based on the environment in WebCallingService registerWebCallingLine method
         domain: 'rtw.prod-us1.rtmsprod.net',
       },
     },
diff --git a/packages/@webex/plugin-cc/src/services/WebCallingService.ts b/packages/@webex/plugin-cc/src/services/WebCallingService.ts
index 7b4f899f81c..574b408c2ae 100644
--- a/packages/@webex/plugin-cc/src/services/WebCallingService.ts
+++ b/packages/@webex/plugin-cc/src/services/WebCallingService.ts
@@ -45,6 +45,13 @@ export default class WebCallingService extends EventEmitter {
   }
 
   public async registerWebCallingLine(): Promise<void> {
+    /** overriding RTMS URL with u2c catalogue wcc-calling-rtms service */
+    await this.webex.internal.services.waitForCatalog('postauth');
+    const rtmsURL = this.webex.internal.services.get('wcc-calling-rtms');
+    if (rtmsURL) {
+      this.callingClientConfig.serviceData.domain = rtmsURL;
+    }
+
     this.callingClient = await createClient(this.webex as any, this.callingClientConfig);
     this.line = Object.values(this.callingClient.getLines())[0];
 
diff --git a/packages/@webex/plugin-cc/src/types.ts b/packages/@webex/plugin-cc/src/types.ts
index 856edc44755..b9440369922 100644
--- a/packages/@webex/plugin-cc/src/types.ts
+++ b/packages/@webex/plugin-cc/src/types.ts
@@ -111,6 +111,8 @@ export interface WebexSDK {
     };
     presence: unknown;
     services: {
+      get: (service: string) => string;
+      waitForCatalog: (service: string) => Promise<void>;
       _hostCatalog: Record<string, ServiceHost[]>;
       _serviceUrls: {
         mobius: string;
diff --git a/packages/@webex/plugin-cc/test/unit/spec/services/WebCallingService.ts b/packages/@webex/plugin-cc/test/unit/spec/services/WebCallingService.ts
index e4fea2efdc9..b91cf03301b 100644
--- a/packages/@webex/plugin-cc/test/unit/spec/services/WebCallingService.ts
+++ b/packages/@webex/plugin-cc/test/unit/spec/services/WebCallingService.ts
@@ -36,7 +36,13 @@ describe('WebCallingService', () => {
       logger: {
         log: jest.fn(),
         error: jest.fn(),
-        info: jest.fn()
+        info: jest.fn(),
+      },
+      internal: {
+        services: {
+          waitForCatalog: jest.fn().mockResolvedValue(undefined),
+          get: jest.fn().mockReturnValue('rtw.prod-us1.rtmsprod.net'),
+        },
       },
     } as unknown as WebexSDK;
 
@@ -63,7 +69,7 @@ describe('WebCallingService', () => {
       answer: jest.fn(),
       mute: jest.fn(),
       isMuted: jest.fn().mockReturnValue(true),
-      end: jest.fn()
+      end: jest.fn(),
     };
 
     webRTCCalling.call = mockCall;
@@ -101,7 +107,39 @@ describe('WebCallingService', () => {
       expect(line.register).toHaveBeenCalled();
       expect(LoggerProxy.log).toHaveBeenCalledWith(
         `WxCC-SDK: Desktop registered successfully, mobiusDeviceId: ${deviceInfo.mobiusDeviceId}`,
-        {"method": "registerWebCallingLine", "module": WEB_CALLING_SERVICE_FILE}
+        {method: 'registerWebCallingLine', module: WEB_CALLING_SERVICE_FILE}
+      );
+    }, 20000); // Increased timeout to 20 seconds
+
+    it('should register WebCallingLine with custom rtms url', async () => {
+      webex.internal.services.get = jest.fn().mockReturnValue('rtw.prod-us2.rtmsprod.net');
+
+      line = callingClient.getLines().line1 as ILine;
+      const deviceInfo = {
+        mobiusDeviceId: 'device123',
+        status: 'registered',
+        setError: jest.fn(),
+        getError: jest.fn(),
+        type: 'line',
+        id: 'line1',
+      };
+
+      const registeredHandler = jest.fn();
+      const lineOnSpy = jest.spyOn(line, 'on').mockImplementation((event, handler) => {
+        if (event === LINE_EVENTS.REGISTERED) {
+          registeredHandler.mockImplementation(handler);
+          handler(deviceInfo);
+        }
+      });
+      expect(config.cc.callingClientConfig.serviceData.domain).toBe('rtw.prod-us1.rtmsprod.net');
+      await expect(webRTCCalling.registerWebCallingLine()).resolves.toBeUndefined();
+      expect(config.cc.callingClientConfig.serviceData.domain).toBe('rtw.prod-us2.rtmsprod.net');
+      expect(createClient).toHaveBeenCalledWith(webex, config.cc.callingClientConfig);
+      expect(lineOnSpy).toHaveBeenCalledWith(LINE_EVENTS.REGISTERED, expect.any(Function));
+      expect(line.register).toHaveBeenCalled();
+      expect(LoggerProxy.log).toHaveBeenCalledWith(
+        `WxCC-SDK: Desktop registered successfully, mobiusDeviceId: ${deviceInfo.mobiusDeviceId}`,
+        {method: 'registerWebCallingLine', module: WEB_CALLING_SERVICE_FILE}
       );
     }, 20000); // Increased timeout to 20 seconds
 
@@ -169,7 +207,7 @@ describe('WebCallingService', () => {
     const mockStream = {
       outputStream: {
         getAudioTracks: jest.fn().mockReturnValue(['']),
-      }
+      },
     };
 
     const localAudioStream = mockStream as unknown as LocalMicrophoneStream;
@@ -183,10 +221,14 @@ describe('WebCallingService', () => {
 
     it('should log error and throw when call.answer fails', () => {
       const error = new Error('Failed to answer');
-      mockCall.answer.mockImplementation(() => { throw error; });
+      mockCall.answer.mockImplementation(() => {
+        throw error;
+      });
 
       expect(() => webRTCCalling.answerCall(localAudioStream, 'task-id')).toThrow(error);
-      expect(webex.logger.error).toHaveBeenCalledWith(`Failed to answer call for task-id. Error: ${error}`);
+      expect(webex.logger.error).toHaveBeenCalledWith(
+        `Failed to answer call for task-id. Error: ${error}`
+      );
     });
 
     it('should log when there is no call to answer', () => {
@@ -201,7 +243,7 @@ describe('WebCallingService', () => {
     const mockStream = {
       outputStream: {
         getAudioTracks: jest.fn().mockReturnValue(['']),
-      }
+      },
     };
 
     const localAudioStream = mockStream as unknown as LocalMicrophoneStream;
@@ -231,10 +273,14 @@ describe('WebCallingService', () => {
 
     it('should log error and throw when call.end fails', () => {
       const error = new Error('Failed to end call');
-      mockCall.end.mockImplementation(() => { throw error; });
+      mockCall.end.mockImplementation(() => {
+        throw error;
+      });
 
       expect(() => webRTCCalling.declineCall('task-id')).toThrow(error);
-      expect(webex.logger.error).toHaveBeenCalledWith(`Failed to end call: task-id. Error: ${error}`);
+      expect(webex.logger.error).toHaveBeenCalledWith(
+        `Failed to end call: task-id. Error: ${error}`
+      );
     });
 
     it('should log when there is no call to end', () => {