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I didn't configured anything or any api to control thing, I only made sure that under group section-> the list of users are active as well as call handling is set to simultaneous type.  

the overall procedure coded is a follows: 
1. get the list of extensions by department :
/account/~/extension?type=Department
2. then I loop over its data to get members of all department

getCallMembersExtensions = (allExtensions) => {
return (extensionResults)=>{
let extensionDetails = extensionResults.json();
let memberList = extensionDetails.records.map(({id}) => {
allExtensions.push(this.getPresenceLink(id))
return platform.get('/account/~/department/${id}/members')
      })
 return Promise.all(memberList)    
    }
}  

4. prepare the presence links  

getMemberPresence = (allExtensions) => {
return (memberDetails) => {
console.log("memberDetails", memberDetails);
memberDetails.map((memberDatum) => {
let memberJson = memberDatum.json();
return memberJson.records.map((r) => {
allExtensions.push(this.getPresenceLink(r.id))
        })
      })

5. set the presence

subscription
        .setEventFilters([...allExtensions, '/account/~/presence'])  
        .register().then(function (response) {
console.log('Success: Subscription is listening');
        }).catch(function(e) {
console.log('Subscription Error: ', e);
        });

5. listen to the events,

const subscription = getRcsdk().createSubscription();
subscription.on(subscription.events.notification, function(accountPresence) {
  console.log("accountPresence", accountPresence)
});

here I receive notifications for both direct agent extension on call or call queue extensions. but in case of call queue extension  , I receive this data

{
  "uuid": "*",
  "event": "/restapi/v1.0/account/*/extension/*/presence?detailedTelephonyState=true",
  "timestamp": "*",
  "subscriptionId": "*",
  "ownerId": "*",
  "body": {
    "extensionId": *,
    "sequence": *,
    "presenceStatus": "Offline"
  }
} 

no caller info, nothing else.. moreover I was expecting that it forwards the call to particular agent(as the agent's ext id is also being listened, I may recieve a notification in callback for same, but this is not happening).
please let me know if I am missing something

How do you implement the call forwarding? Via Active Call Control API or using preconfigured forwarding rules?

Can you explain more on this? 

3. when I select on department 's extension on call, the call is not forwarded to agent directly, and I am not receiving that notification in callback for that agent.

How do you select and how do you forward the call. Would be helpful if you provide some codes