SIP E-Tag Missing Error

Hi All,

Please find the below the sample code that is working fine with sandbox credentials,It means that when I try to call outside to any US number, the call gets connected,

However, when I use production credentials to call any US number, I am unable to do so. The operator says, "The number you dialled is temporarily unavailable. Please try contacting the customer service Goodbye," and I got the error, which I attached as a screenshot...

even though the number that I'm using has the digital line assigned to it with proper profile setup

It's worth noting that when I use the production credentials to call the numbers which is inside the user's extension list (service account -> users -> Users with Extensions), the call is connected to those numbers.

means call can be connected to the numbers which is inside ringcentral organization.

var appKey = '...';
var appSecret = '...';
var appName = '...';
var appVersion = '...';
 
var sdk = new RingCentral.SDK({
    appKey: appKey,
    appSecret: appSecret,
    appName: appName,
    appVersion: appVersion,
    server: RingCentral.SDK.server.production // or .sandbox
});
 
var remoteVideoElement =  document.getElementById('remoteVideo');
var localVideoElement  = document.getElementById('localVideo');
 
var platform = sdk.platform();
platform.auth().setData(tokens)
if (platform.loggedIn()){
    platform.post('/client-info/sip-provision', {
          sipInfo: [{transport: 'WSS'}]
    })
    .then(function(res) { // Doing nested then because we need loginResponse in a simple way
        return new RingCentral.WebPhone(res.json(), { // optional
              appKey: appKey,
              appName: appName,
              appVersion: appVersion,
              uuid: loginResponse.json().endpoint_id,
              logLevel: 1, // error 0, warn 1, log: 2, debug: 3
              audioHelper: {
                  enabled: true, // enables audio feedback when web phone is ringing or making a call
                  incoming: 'path-to-audio/incoming.ogg', // path to audio file for incoming call
                  outgoing: 'path-to-audio/outgoing.ogg' // path to aduotfile for outgoing call
              },
              media:{
                  remote: remoteVideoElement,
                  local: localVideoElement
              },
              //to enable QoS Analytics Feature
              enableQos:true
          });
 
    })
    .then(function(webPhone){
 
        // YOUR CODE HERE
        
    })
}

Any Help much more appreciated..!

@Tyler Liu @Phong Vu