diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7386495..19c5b5d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,25 @@
 # Change Log
 
-## [4.18.0](https://github.com/plivo/plivo-node/releases/tag/v4.18.0)(2021-05-28)
-- New Send Message interface along with existing interface support.
+## [v4.20.0](https://github.com/plivo/plivo-node/tree/v4.20.0) (2021-07-13)
+- Power pack ID has been included to the response for the [list all messages API](https://www.plivo.com/docs/sms/api/message/list-all-messages/) and the [get message details API](https://www.plivo.com/docs/sms/api/message#retrieve-a-message).
+- Support for filtering messages by Power pack ID has been added to the [list all messages API](https://www.plivo.com/docs/sms/api/message#list-all-messages).
+
+## [v4.19.2](https://github.com/plivo/plivo-node/tree/v4.19.2) (2021-07-08)
+- MPC SDK fixes to pass params in a user-friendly manner.
+
+## [v4.19.1](https://github.com/plivo/plivo-node/tree/v4.19.1) (2021-07-05)
+- **WARNING**: Removed the total_count parameter in meta data for list MDR response
+
+## [4.19.0](https://github.com/plivo/plivo-node/releases/tag/v4.19.0)(2021-07-02)
+-  Added CallerName param in AddParticpant
+-  Added support for Parallel behaviour of RingTimeout and Delaydial.
+-  Added support for Recording at Member Level
+
+## [4.18.1](https://github.com/plivo/plivo-node/releases/tag/v4.18.1)(2021-06-25)
+-  Fixed the mms media upload functionality
+
+## [4.18.0](https://github.com/plivo/plivo-node/releases/tag/v4.18.0)(2021-06-15)
+-  Added stir verification param as part of Get CDR and live call APIs
 
 ## [4.17.1](https://github.com/plivo/plivo-node/releases/tag/v4.17.1)(2021-05-06)
 -  Added Fix for Adaptive Powerpack Create & Update functions
diff --git a/lib/resources/call.js b/lib/resources/call.js
index 625c375..d4f4c01 100644
--- a/lib/resources/call.js
+++ b/lib/resources/call.js
@@ -75,6 +75,7 @@ export class GetLiveCallResponse {
         this.requestUuid = params.requestUuid;
         this.sessionStart = params.sessionStart;
         this.to = params.to;
+        this.stirVerification = params.stirVerification;
     }
 }
 export class RetrieveCallResponse {
@@ -100,6 +101,7 @@ export class RetrieveCallResponse {
         this.toNumber = params.toNumber;
         this.totalAmount = params.totalAmount;
         this.totalRate = params.totalRate;
+        this.stirVerification = params.stirVerification;
     }
 }
 
@@ -125,6 +127,7 @@ export class ListAllCallsResponse {
         this.toNumber = params.toNumber;
         this.totalAmount = params.totalAmount;
         this.totalRate = params.totalRate;
+        this.stirVerification = params.stirVerification;
     }
 }
 
diff --git a/lib/resources/media.js b/lib/resources/media.js
index ad027a7..aa229ed 100644
--- a/lib/resources/media.js
+++ b/lib/resources/media.js
@@ -97,7 +97,7 @@ export class MediaInterface extends PlivoResourceInterface {
         params.file = files
 
         let client = this[clientKey];
-
+        params.multipart = true;
         return new Promise((resolve, reject) => {
             client('POST', action, params)
                 .then(response => {
diff --git a/lib/resources/messages.js b/lib/resources/messages.js
index ab5bc93..545c474 100644
--- a/lib/resources/messages.js
+++ b/lib/resources/messages.js
@@ -42,6 +42,7 @@ export class MessageGetResponse {
         this.totalAmount = params.totalAmount;
         this.totalRate = params.totalRate;
         this.units = params.units;
+        this.powerpackID = params.powerpackId
     }
 }
 
@@ -60,6 +61,7 @@ export class MessageListResponse {
         this.totalAmount = params.totalAmount;
         this.totalRate = params.totalRate;
         this.units = params.units;
+        this.powerpackID = params.powerpackId;
     }
 }
 
diff --git a/lib/resources/multiPartyCall.js b/lib/resources/multiPartyCall.js
index 0ffe665..0fe35c6 100644
--- a/lib/resources/multiPartyCall.js
+++ b/lib/resources/multiPartyCall.js
@@ -7,7 +7,8 @@ import {
   validDateFormat,
   validRange,
   validMultipleDestinationNos,
-  isOneAmongStringUrl, multiValidParam
+  validMultipleDestinationIntegers,
+  isOneAmongStringUrl, multiValidParam, InvalidRequestError
 } from '../rest/utils.js'
 
 const clientKey = Symbol();
@@ -61,6 +62,11 @@ export class MultiPartyCall extends PlivoResource{
       validParam('callUuid', params.callUuid, [String], false)
     }
 
+    if(params.callerName){
+      validParam('callerName', params.callerName, [String], false)
+      validRange('callerName', params.callerName.length, false, 1, 50)
+    }
+
     if(params.callStatusCallbackUrl){
       validUrl('callStatusCallbackUrl', params.callStatusCallbackUrl, false)
     }
@@ -99,11 +105,29 @@ export class MultiPartyCall extends PlivoResource{
     }
 
     if(params.ringTimeout || params.ringTimeout === 0){
-      validRange('ringTimeout', params.ringTimeout, false, 15, 120)
+      validParam('ringTimeout', params.ringTimeout, [String, Number], false)
+      if(Number.isInteger(params.ringTimeout)){
+        validRange('RingTimeout', params.ringTimeout, false, 15, 120)
+      }
+      else{
+        validMultipleDestinationIntegers('ringTimeout', params.ringTimeout)
+      }
     }
     else {
       params.ringTimeout = 45
     }
+    if(params.delayDial){
+      validParam('delayDial', params.delayDial, [String, Number], false)
+      if(Number.isInteger(params.delayDial)){
+        validRange('DelayDial', params.delayDial, false, 1, 120)
+      }
+      else{
+        validMultipleDestinationIntegers('delayDial', params.delayDial)
+      }
+    }
+    else {
+      params.delayDial = 0
+    }
 
     if(params.maxDuration || params.maxDuration === 0){
       validRange('maxDuration', params.maxDuration, false, 300, 28800)
@@ -234,7 +258,7 @@ export class MultiPartyCall extends PlivoResource{
       params.hold = 'false'
     }
 
-    if(params.startMpcOnEnter){
+    if(params.startMpcOnEnter!=null){
       validParam('startMpcOnEnter', params.startMpcOnEnter, [Boolean, String], false)
     }
     else {
@@ -283,11 +307,18 @@ export class MultiPartyCall extends PlivoResource{
       params.exitSoundMethod = 'GET'
     }
     params.isVoiceRequest = 'true';
+    params.callerName = params.callerName || params.from;
     return super.executeAction(this.id + '/Participant/', 'POST', params)
   }
 
-  start(){
-    return super.executeAction(this.id + '/', 'POST', {'status' : 'active', 'isVoiceRequest' : 'true'})
+  start(params){
+    if(params.status) {
+      validParam('status', params.status.toLowerCase(), [String], true, 'active')
+    }
+    else{
+      throw new InvalidRequestError("status is a mandatory parameter");
+    }
+    return super.executeAction(this.id + '/', 'POST', {'status' : params.status.toLowerCase(), 'isVoiceRequest' : 'true'})
   }
 
   stop(){
@@ -376,6 +407,39 @@ export class MultiPartyCallParticipant extends PlivoSecondaryResource{
   getParticipant(){
     return super.executeAction(this.id, this.secondaryId, 'GET',{'isVoiceRequest' : 'true'})
   }
+  startParticipantRecording(params = {}){
+    if(params.fileFormat){
+      validParam('fileFormat', params.fileFormat, [String], false, ['mp3', 'wav'])
+    }
+    else {
+      params.fileFormat = 'mp3'
+    }
+
+    if(params.statusCallbackUrl){
+      validUrl('statusCallbackUrl', params.statusCallbackUrl, false)
+    }
+
+    if(params.statusCallbackMethod){
+      validParam('statusCallbackMethod', params.statusCallbackMethod.toUpperCase(), [String], false, ['GET', 'POST'])
+    }
+    else {
+      params.statusCallbackMethod = 'POST'
+    }
+    params.isVoiceRequest = 'true';
+    return super.executeAction(this.id , this.secondaryId + '/Record', 'POST', params)
+  }
+
+  stopParticipantRecording(){
+    return super.executeAction(this.id , this.secondaryId +'/Record', 'DELETE',{'isVoiceRequest' : 'true'})
+  }
+
+  pauseParticipantRecording(){
+    return super.executeAction(this.id , this.secondaryId + '/Record/Pause', 'POST',{'isVoiceRequest' : 'true'})
+  }
+
+   resumeParticipantRecording(){
+    return super.executeAction(this.id , this.secondaryId + '/Record/Resume', 'POST',{'isVoiceRequest' : 'true'})
+  }
 
 }
 
@@ -451,14 +515,16 @@ export class MultiPartyCallInterface extends PlivoResourceInterface{
     return super.list(params);
   }
 
-  get(uuid = null, friendlyName = null){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  get(params={}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).get();
   }
 
@@ -476,116 +542,192 @@ export class MultiPartyCallInterface extends PlivoResourceInterface{
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).addParticipant(params)
   }
 
-  start(uuid = null, friendlyName = null){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  start(params = {}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
-    return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).start()
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
+    return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).start(params)
   }
 
-  stop(uuid = null, friendlyName = null){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  stop(params = {}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).stop()
   }
 
-  startRecording(uuid = null, friendlyName = null, params){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  startRecording(params={}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).startRecording(params)
   }
 
-  stopRecording(uuid = null, friendlyName = null){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  stopRecording(params={}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).stopRecording()
   }
 
-  pauseRecording(uuid = null, friendlyName = null){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  pauseRecording(params={}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).pauseRecording()
   }
 
-  resumeRecording(uuid = null, friendlyName = null){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  resumeRecording(params={}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).resumeRecording()
   }
 
-  listParticipants(uuid = null, friendlyName = null, params){
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+  startParticipantRecording(participantId, params={}){
+    validParam('participantId', participantId, [String, Number], true)
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
+    return new MultiPartyCallParticipant(this[clientKey], {id: mpcId[0] + mpcId[1], secondaryId: participantId}).startParticipantRecording(params)
+  }
+
+  stopParticipantRecording(participantId, params={}){
+    validParam('participantId', participantId, [String, Number], true)
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
+    }
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
+    }
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
+    return new MultiPartyCallParticipant(this[clientKey], {id: mpcId[0] + mpcId[1], secondaryId: participantId}).stopParticipantRecording()
+  }
+
+  pauseParticipantRecording(participantId, params={}){
+    validParam('participantId', participantId, [String, Number], true)
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
+    }
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
+    }
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
+    return new MultiPartyCallParticipant(this[clientKey], {id: mpcId[0] + mpcId[1], secondaryId: participantId}).pauseParticipantRecording()
+  }
+
+  resumeParticipantRecording(participantId, params={}){
+    validParam('participantId', participantId, [String, Number], true)
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
+    }
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
+    }
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
+    return new MultiPartyCallParticipant(this[clientKey], {id: mpcId[0] + mpcId[1], secondaryId: participantId}).resumeParticipantRecording()
+  }
+
+  listParticipants(params={}){
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
+    }
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
+    }
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCall(this[clientKey], {id: mpcId[0] + mpcId[1]}).listParticipants(params)
   }
 
-  updateParticipant(participantId, uuid= null, friendlyName = null, params){
+  updateParticipant(participantId, params={}){
     validParam('participantId', participantId, [String, Number], true)
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCallParticipant(this[clientKey], {id: mpcId[0] + mpcId[1], secondaryId: participantId}).updateParticipant(params)
   }
 
-  kickParticipant(participantId, uuid = null, friendlyName = null){
+  kickParticipant(participantId, params={}){
     validParam('participantId', participantId, [String, Number], true)
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCallParticipant(this[clientKey], {id: mpcId[0] + mpcId[1], secondaryId: participantId}).kickParticipant()
   }
 
-  getParticipant(participantId, uuid = null, friendlyName = null){
+  getParticipant(participantId, params={}){
     validParam('participantId', participantId, [String, Number], true)
-    if(uuid){
-      validParam('uuid', uuid, [String], false)
+    if(params.uuid){
+      validParam('uuid', params.uuid, [String], false)
     }
-    if(friendlyName){
-      validParam('friendlyName', friendlyName, [String], false)
+    if(params.friendlyName){
+      validParam('friendlyName', params.friendlyName, [String], false)
     }
-    let mpcId = this.makeMpcId(uuid, friendlyName)
+    let mpcId = this.makeMpcId(params.uuid, params.friendlyName)
+    delete params.uuid
+    delete params.friendlyName
     return new MultiPartyCallParticipant(this[clientKey], {id: mpcId[0] + mpcId[1], secondaryId: participantId}).getParticipant()
   }
 
diff --git a/lib/rest/axios.js b/lib/rest/axios.js
index 61f8cde..5316274 100644
--- a/lib/rest/axios.js
+++ b/lib/rest/axios.js
@@ -46,7 +46,14 @@ export function Axios(config) {
           if (key != 'file') {
             multipartParams.append(key, params[key]);
           } else {
-            multipartParams.append(key, require('fs').createReadStream(params[key]));
+            // In case files are in array
+            if (Array.isArray(params.file)) {
+              for (let index = 0; index < params.file.length; index++) {
+                multipartParams.append(key, require('fs').createReadStream(params.file[index]));
+              }
+            }else{
+              multipartParams.append(key, require('fs').createReadStream(params[key]));
+            }
           }
         }
 
@@ -87,6 +94,10 @@ export function Axios(config) {
           });
         })
         .catch(function (error) {
+          //client side exception like file not found case
+          if (error.response == undefined){
+            reject(error.stack );
+          }
           const exceptionClass = {
             400: Exceptions.InvalidRequestError,
             401: Exceptions.AuthenticationError,
diff --git a/lib/rest/request-test.js b/lib/rest/request-test.js
index 9f60e97..18e1791 100644
--- a/lib/rest/request-test.js
+++ b/lib/rest/request-test.js
@@ -1158,8 +1158,7 @@ export function Request(config) {
               limit: 20,
               next: '/v1/Account/{auth_id}/Message/?limit=20&error_code=200&offset=20',
               offset: 0,
-              previous: null,
-              total_count: 22
+              previous: null
             },
             objects: [
               {
diff --git a/lib/rest/utils.js b/lib/rest/utils.js
index 9facdc5..8a7538c 100644
--- a/lib/rest/utils.js
+++ b/lib/rest/utils.js
@@ -112,6 +112,26 @@ export function validMultipleDestinationNos(paramName, paramValue, options = {})
   }
 }
 
+export function validMultipleDestinationIntegers(paramName, paramValue){
+  let val = paramValue.split("<");
+  for (let i=0; i<val.length; i++){
+    if (!isNaN(val[i]) && Number.isInteger(parseFloat(val[i]))){
+      if(paramName=="delayDial"){
+        if(val[i]!='0'){
+          validRange('DelayDial Destination Value', parseInt(val[i]), false, 1, 120);
+        }
+      }
+      else if (paramName=="ringTimeout"){
+        validRange('RingTimeout Destination Value', parseInt(val[i]), false, 15, 120);
+      }
+    }
+    else{
+      throw new InvalidRequestError( paramName + " Destination value must be integer");
+    }
+  }
+  return true;
+}
+
 export function validParam(paramName, paramValue, expectedTypes = null, mandatory = false, expectedValues = null){
   if(mandatory && !paramValue){
     throw new InvalidRequestError(paramName + " is a required parameter");
diff --git a/package.json b/package.json
index a6ffb81..d429fd9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "plivo",
-  "version": "4.18.0",
+  "version": "4.20.0",
   "description": "A Node.js SDK to make voice calls and send SMS using Plivo and to generate Plivo XML",
   "homepage": "https://github.com/plivo/plivo-node",
   "files": [
diff --git a/types/resources/messages.d.ts b/types/resources/messages.d.ts
index 6d6b37d..c709edc 100644
--- a/types/resources/messages.d.ts
+++ b/types/resources/messages.d.ts
@@ -19,6 +19,7 @@ export class MessageGetResponse {
 	totalAmount: string;
 	totalRate: string;
 	units: string;
+	powerpackId: string;
 }
 export class MessageListResponse {
 	constructor(params: object);
@@ -34,6 +35,7 @@ export class MessageListResponse {
 	totalAmount: string;
 	totalRate: string;
     units: string;
+	powerpackId: string;
 }
 export class MMSMediaResponse {
 	constructor(params: object);