diff --git a/app/javascript/dashboard/api/channel/whatsapp/whatsappCallsAPI.js b/app/javascript/dashboard/api/channel/whatsapp/whatsappCallsAPI.js
index ec24aae34..d458c1e5d 100644
--- a/app/javascript/dashboard/api/channel/whatsapp/whatsappCallsAPI.js
+++ b/app/javascript/dashboard/api/channel/whatsapp/whatsappCallsAPI.js
@@ -10,10 +10,13 @@ class WhatsappCallsAPI extends ApiClient {
     return axios.get(`${this.url}/${callId}`).then(r => r.data);
   }
 
-  initiate(conversationId, sdpOffer) {
+  // Either conversationId, or contactId + inboxId to let the BE resolve the conversation.
+  initiate({ conversationId, contactId, inboxId }, sdpOffer) {
     return axios
       .post(`${this.url}/initiate`, {
         conversation_id: conversationId,
+        contact_id: contactId,
+        inbox_id: inboxId,
         sdp_offer: sdpOffer,
       })
       .then(r => r.data);
diff --git a/app/javascript/dashboard/components-next/Contacts/VoiceCallButton.vue b/app/javascript/dashboard/components-next/Contacts/VoiceCallButton.vue
index 7e2b6f0c4..5c7ec691d 100644
--- a/app/javascript/dashboard/components-next/Contacts/VoiceCallButton.vue
+++ b/app/javascript/dashboard/components-next/Contacts/VoiceCallButton.vue
@@ -16,7 +16,6 @@ import { useAlert } from 'dashboard/composables';
 import { frontendURL, conversationUrl } from 'dashboard/helper/URLHelper';
 import { useCallsStore } from 'dashboard/stores/calls';
 import { useWhatsappCallSession } from 'dashboard/composables/useWhatsappCallSession';
-import ContactAPI from 'dashboard/api/contacts';
 
 import Button from 'dashboard/components-next/button/Button.vue';
 import Dialog from 'dashboard/components-next/dialog/Dialog.vue';
@@ -83,39 +82,18 @@ const navigateToConversation = conversationId => {
 
 const whatsappCallSession = useWhatsappCallSession();
 
-// Find the most recent open conversation for this contact in the picked inbox.
-// WhatsApp /initiate is conversation-scoped (unlike Twilio's contact-scoped path).
-// Pass inboxId so the BE applies the filter before the 20-row cap — without it,
-// contacts whose latest WhatsApp conversation falls outside the 20 most recent
-// across all inboxes would be treated as having no conversation.
-const findWhatsappConversationId = async inboxId => {
-  const { data } = await ContactAPI.getConversations(props.contactId, {
-    inboxId,
-  });
-  const conversations = data?.payload || [];
-  const match = [...conversations].sort(
-    (a, b) => (b.last_activity_at || 0) - (a.last_activity_at || 0)
-  )[0];
-  return match?.id || null;
-};
-
 const startWhatsappCall = async (inboxId, conversationIdHint) => {
-  // WhatsApp /initiate is conversation-scoped, so we must hand it a
-  // conversation. Use the caller's hint when given (in-conversation flow);
-  // otherwise pick the most recent one in the inbox.
-  const conversationId =
-    conversationIdHint || (await findWhatsappConversationId(inboxId));
-  if (!conversationId) {
-    useAlert(t('CONTACT_PANEL.CALL_FAILED'));
-    return;
-  }
-
-  const response =
-    await whatsappCallSession.initiateOutboundCall(conversationId);
+  const response = await whatsappCallSession.initiateOutboundCall(
+    conversationIdHint
+      ? { conversationId: conversationIdHint }
+      : { contactId: props.contactId, inboxId }
+  );
   // The composable returns { status: 'locked' } when an init is already in
   // flight or a call is already active; treat that as a soft no-op rather than
   // claiming success.
   if (response?.status === VOICE_CALL_OUTBOUND_INIT_STATUS.LOCKED) return;
+
+  const conversationId = response?.conversation_id || conversationIdHint;
   if (!response?.id) {
     // Permission template path returns no call id. Mirror the header button and
     // surface whether the request was just sent or is already pending instead of
diff --git a/app/javascript/dashboard/components-next/NewConversation/ComposeConversation.vue b/app/javascript/dashboard/components-next/NewConversation/ComposeConversation.vue
index 02a00c703..2446e0e2b 100644
--- a/app/javascript/dashboard/components-next/NewConversation/ComposeConversation.vue
+++ b/app/javascript/dashboard/components-next/NewConversation/ComposeConversation.vue
@@ -234,6 +234,7 @@ onMounted(() => resetContacts());
     ref="popoverRef"
     :align="align"
     :show-content-border="false"
+    :close-on-scroll="false"
     @show="onPopoverShow"
     @hide="onPopoverHide"
   >
diff --git a/app/javascript/dashboard/components-next/message/bubbles/VoiceCall.vue b/app/javascript/dashboard/components-next/message/bubbles/VoiceCall.vue
index 34eb1eaff..1a127d9e6 100644
--- a/app/javascript/dashboard/components-next/message/bubbles/VoiceCall.vue
+++ b/app/javascript/dashboard/components-next/message/bubbles/VoiceCall.vue
@@ -263,9 +263,9 @@ const handleCallBack = async () => {
   if (!canCallBack.value || isInitiatingCall.value) return;
   try {
     if (isWhatsapp.value) {
-      const response = await whatsappCallSession.initiateOutboundCall(
-        conversationId.value
-      );
+      const response = await whatsappCallSession.initiateOutboundCall({
+        conversationId: conversationId.value,
+      });
       if (response?.status === VOICE_CALL_OUTBOUND_INIT_STATUS.LOCKED) return;
       // Permission template path returns no call id — show banner, no widget yet.
       if (!response?.id) {
diff --git a/app/javascript/dashboard/components-next/popover/Popover.vue b/app/javascript/dashboard/components-next/popover/Popover.vue
index 5b67e572f..9d369133f 100644
--- a/app/javascript/dashboard/components-next/popover/Popover.vue
+++ b/app/javascript/dashboard/components-next/popover/Popover.vue
@@ -1,7 +1,11 @@
 <script setup>
 import { ref, computed, watch, nextTick } from 'vue';
 import { vOnClickOutside } from '@vueuse/components';
-import { useBreakpoints, breakpointsTailwind } from '@vueuse/core';
+import {
+  useBreakpoints,
+  breakpointsTailwind,
+  useEventListener,
+} from '@vueuse/core';
 import { useDropdownPosition } from 'dashboard/composables/useDropdownPosition';
 import { useKeyboardEvents } from 'dashboard/composables/useKeyboardEvents';
 import TeleportWithDirection from 'dashboard/components-next/TeleportWithDirection.vue';
@@ -16,6 +20,10 @@ const props = defineProps({
     type: Boolean,
     default: false,
   },
+  closeOnScroll: {
+    type: Boolean,
+    default: true,
+  },
   showContentBorder: {
     type: Boolean,
     default: true,
@@ -41,8 +49,12 @@ const { fixedPosition, updatePosition } = useDropdownPosition(
   { align: props.align }
 );
 
+const SCROLL_CLOSE_THRESHOLD = 24;
+const triggerTopAtOpen = ref(0);
+
 const show = async () => {
   isActive.value = true;
+  triggerTopAtOpen.value = triggerRef.value?.getBoundingClientRect().top ?? 0;
   if (!isMobile.value) {
     await nextTick();
     updatePosition();
@@ -56,6 +68,22 @@ const hide = () => {
   emit('hide');
 };
 
+// The teleported popover tracks its trigger while ancestors scroll; allow
+// small drift (trackpad inertia), but close once the trigger moves further.
+useEventListener(
+  window,
+  'scroll',
+  event => {
+    if (!props.closeOnScroll || !showPopover.value) return;
+    if (popoverRef.value?.contains(event.target)) return;
+    const top = triggerRef.value?.getBoundingClientRect().top ?? 0;
+    if (Math.abs(top - triggerTopAtOpen.value) > SCROLL_CLOSE_THRESHOLD) {
+      hide();
+    }
+  },
+  { capture: true, passive: true }
+);
+
 const toggle = async () => {
   if (isActive.value) hide();
   else await show();
diff --git a/app/javascript/dashboard/components/widgets/conversation/ConversationCallButton.vue b/app/javascript/dashboard/components/widgets/conversation/ConversationCallButton.vue
index d0d2a2778..f59df929c 100644
--- a/app/javascript/dashboard/components/widgets/conversation/ConversationCallButton.vue
+++ b/app/javascript/dashboard/components/widgets/conversation/ConversationCallButton.vue
@@ -69,9 +69,9 @@ const callButtonTooltip = computed(() =>
 const startWhatsappCall = async () => {
   if (whatsappCallSession.isInitiating.value) return;
   try {
-    const response = await whatsappCallSession.initiateOutboundCall(
-      props.chat.id
-    );
+    const response = await whatsappCallSession.initiateOutboundCall({
+      conversationId: props.chat.id,
+    });
 
     // Composable returns LOCKED when init is already in flight or a call is
     // active; soft no-op so a parallel click doesn't trigger a banner.
diff --git a/app/javascript/dashboard/composables/useWhatsappCallSession.js b/app/javascript/dashboard/composables/useWhatsappCallSession.js
index b934c0997..9d17c6b06 100644
--- a/app/javascript/dashboard/composables/useWhatsappCallSession.js
+++ b/app/javascript/dashboard/composables/useWhatsappCallSession.js
@@ -308,7 +308,8 @@ export function useWhatsappCallSession() {
     }
   };
 
-  const initiateOutboundCall = async conversationId => {
+  // target: { conversationId } or { contactId, inboxId }
+  const initiateOutboundCall = async target => {
     // Module-scoped lock + active-session guard so a second click — from the
     // same composable instance OR a different one (header vs contact panel)
     // OR while a call is already live — can't tear down the in-flight setup
@@ -320,10 +321,7 @@ export function useWhatsappCallSession() {
     isInitiatingOutbound.value = true;
     try {
       const sdpOffer = await prepareOutboundOffer();
-      const response = await WhatsappCallsAPI.initiate(
-        conversationId,
-        sdpOffer
-      );
+      const response = await WhatsappCallsAPI.initiate(target, sdpOffer);
       if (response?.id) {
         activeCallId = response.id;
         // A connect webhook that raced ahead of this response was buffered;
@@ -354,7 +352,7 @@ export function useWhatsappCallSession() {
         data?.status === VOICE_CALL_OUTBOUND_INIT_STATUS.PERMISSION_REQUESTED ||
         data?.status === VOICE_CALL_OUTBOUND_INIT_STATUS.PERMISSION_PENDING
       ) {
-        return { status: data.status };
+        return { status: data.status, conversation_id: data.conversation_id };
       }
       throw e;
     } finally {
diff --git a/enterprise/app/controllers/api/v1/accounts/whatsapp_calls_controller.rb b/enterprise/app/controllers/api/v1/accounts/whatsapp_calls_controller.rb
index a0627ce49..2f86e0de8 100644
--- a/enterprise/app/controllers/api/v1/accounts/whatsapp_calls_controller.rb
+++ b/enterprise/app/controllers/api/v1/accounts/whatsapp_calls_controller.rb
@@ -1,8 +1,6 @@
 class Api::V1::Accounts::WhatsappCallsController < Api::V1::Accounts::BaseController
-  PERMISSION_REQUEST_THROTTLE = 5.minutes
-
   before_action :set_call, only: %i[show accept reject terminate upload_recording]
-  before_action :set_conversation, only: :initiate
+  before_action :set_call_context, only: :initiate
   before_action :ensure_calling_enabled, only: :initiate
   before_action :ensure_sdp_offer, only: :initiate
   before_action :ensure_contact_phone, only: :initiate
@@ -53,7 +51,7 @@ class Api::V1::Accounts::WhatsappCallsController < Api::V1::Accounts::BaseContro
   end
 
   def provider_service
-    @provider_service ||= @conversation.inbox.channel.provider_service
+    @provider_service ||= @inbox.channel.provider_service
   end
 
   def set_call
@@ -61,13 +59,38 @@ class Api::V1::Accounts::WhatsappCallsController < Api::V1::Accounts::BaseContro
     authorize @call.conversation, :show?
   end
 
-  def set_conversation
+  def set_call_context
+    params[:conversation_id].present? ? set_context_from_conversation : set_context_from_contact
+  end
+
+  def set_context_from_conversation
     @conversation = Current.account.conversations.find_by!(display_id: params[:conversation_id])
     authorize @conversation, :show?
+    @inbox = @conversation.inbox
+    @contact = @conversation.contact
+  end
+
+  def set_context_from_contact
+    @inbox = Current.account.inboxes.find(params[:inbox_id])
+    authorize @inbox, :show?
+    @contact = Current.account.contacts.find(params[:contact_id])
+    @conversation = conversation_builder.existing_conversation
+    # Authorize the thread the call will land in — after the dial is too late to refuse a ringing call.
+    authorize(@conversation || conversation_builder.new_conversation, :show?)
+  end
+
+  def conversation_builder
+    @conversation_builder ||= Whatsapp::CallConversationBuilder.new(inbox: @inbox, contact: @contact, user: Current.user)
+  end
+
+  # Created only after the dial succeeds, so a failed call leaves no empty thread and there is nothing to
+  # roll back. Re-authorized because a concurrent caller may have created the thread we get back.
+  def open_conversation!
+    (@conversation || conversation_builder.perform!).tap { |conversation| authorize conversation, :show? }
   end
 
   def ensure_calling_enabled
-    channel = @conversation.inbox.channel
+    channel = @inbox.channel
     return if channel.is_a?(Channel::Whatsapp) && channel.voice_enabled?
 
     render_could_not_create_error(I18n.t('errors.whatsapp.calls.not_enabled'))
@@ -80,7 +103,7 @@ class Api::V1::Accounts::WhatsappCallsController < Api::V1::Accounts::BaseContro
   end
 
   def ensure_contact_phone
-    return if @conversation.contact&.phone_number.present?
+    return if @contact.phone_number.present?
 
     render_could_not_create_error(I18n.t('errors.whatsapp.calls.contact_phone_required'))
   end
@@ -105,92 +128,45 @@ class Api::V1::Accounts::WhatsappCallsController < Api::V1::Accounts::BaseContro
   end
 
   def create_outbound_call
-    contact_phone = @conversation.contact.phone_number.delete('+')
-    # Claim for the caller only if unassigned at trigger time (before the round-trip); wins over auto-assignment.
-    claim_for_caller = @conversation.assignee_id.nil?
+    # A reused thread unassigned at click time is claimed for the caller (wins over auto-assignment); a
+    # fresh thread (@conversation nil until the dial succeeds) is created already assigned to the caller.
+    claim_for_caller = @conversation.present? && @conversation.assignee_id.nil?
 
-    result = provider_service.initiate_call(contact_phone, params[:sdp_offer])
+    result = provider_service.initiate_call(@contact.phone_number.delete('+'), params[:sdp_offer])
     provider_call_id = result.dig('calls', 0, 'id') || result['call_id']
 
+    @conversation = open_conversation!
     @conversation.with_lock { @conversation.update!(assignee: Current.user) } if claim_for_caller
 
+    create_call_record(provider_call_id)
+  end
+
+  def create_call_record(provider_call_id)
+    existing = Current.account.calls.whatsapp.find_by(provider_call_id: provider_call_id)
+    return existing if existing
+
     Current.account.calls.create!(
       provider: :whatsapp, inbox: @conversation.inbox, conversation: @conversation, contact: @conversation.contact,
       provider_call_id: provider_call_id, direction: :outgoing, status: 'ringing',
       accepted_by_agent_id: Current.user.id,
       meta: { 'sdp_offer' => params[:sdp_offer], 'ice_servers' => Call.default_ice_servers }
     )
+  rescue ActiveRecord::RecordNotUnique
+    # A webhook inserted the row between the find_by above and this create; reconcile to it.
+    Current.account.calls.whatsapp.find_by!(provider_call_id: provider_call_id)
   end
 
-  # Meta error 138006 means the contact hasn't opted in yet; send the opt-in
-  # template (throttled, behind a conversation lock to prevent double-send).
   def render_permission_request
-    status = nil
-    @conversation.with_lock do
-      if permission_request_throttled?
-        status = 'permission_pending'
-        next
-      end
-
-      sent = send_permission_request_safely
-      if sent
-        record_permission_request_wamid(sent)
-        emit_permission_requested_activity
-        status = 'permission_requested'
-      else
-        status = 'failed'
-      end
-    end
+    # Raised mid-dial, so a fresh contact has no thread yet — open one for the opt-in template to land in.
+    @conversation = open_conversation!
+    status = Whatsapp::CallPermissionRequestService.new(conversation: @conversation).perform
 
     return render_could_not_create_error(I18n.t('errors.whatsapp.calls.permission_request_failed')) if status == 'failed'
 
     # 422 (not 200) so any client treating 2xx as "call placed" can't mistake
     # the permission-template path for a successful dial. The FE composable
     # detects this status and surfaces the banner instead of throwing.
-    render json: { status: status }, status: :unprocessable_entity
-  end
-
-  def permission_request_throttled?
-    last_requested = @conversation.additional_attributes&.dig('call_permission_requested_at')
-    last_requested.present? && Time.zone.parse(last_requested) > PERMISSION_REQUEST_THROTTLE.ago
-  end
-
-  # Treat transport errors as a falsy return so we render 422 rather than 500.
-  def send_permission_request_safely
-    provider_service.send_call_permission_request(
-      @conversation.contact.phone_number.delete('+'),
-      *permission_request_body_args
-    )
-  rescue StandardError => e
-    Rails.logger.warn "[WHATSAPP CALL] permission_request failed: #{e.class} #{e.message}"
-    nil
-  end
-
-  # Pass the inbox-level override only when present so the provider falls back
-  # to the i18n default for inboxes that haven't customized the prompt.
-  def permission_request_body_args
-    custom_body = @conversation.inbox.channel.provider_config&.dig('call_permission_request_body').presence
-    custom_body ? [custom_body] : []
-  end
-
-  def emit_permission_requested_activity
-    content = I18n.t(
-      'conversations.activity.whatsapp_call.permission_requested',
-      contact_name: @conversation.contact.name
-    )
-    ::Conversations::ActivityMessageJob.perform_later(
-      @conversation,
-      { account_id: @conversation.account_id, inbox_id: @conversation.inbox_id, message_type: :activity, content: content }
-    )
-  end
-
-  # Stash the outbound wamid so the reply webhook can match context.id back here.
-  def record_permission_request_wamid(sent)
-    attrs = (@conversation.additional_attributes || {}).merge(
-      'call_permission_requested_at' => Time.current.iso8601,
-      'call_permission_request_message_id' => sent.dig('messages', 0, 'id')
-    )
-    @conversation.update!(additional_attributes: attrs)
+    render json: { status: status, conversation_id: @conversation.display_id }, status: :unprocessable_entity
   end
 
   def render_call_error(error)
diff --git a/enterprise/app/services/whatsapp/call_conversation_builder.rb b/enterprise/app/services/whatsapp/call_conversation_builder.rb
new file mode 100644
index 000000000..665f2fb20
--- /dev/null
+++ b/enterprise/app/services/whatsapp/call_conversation_builder.rb
@@ -0,0 +1,32 @@
+class Whatsapp::CallConversationBuilder
+  pattr_initialize [:inbox!, :contact!, :user!]
+
+  # Mirrors the continuity rule in Whatsapp::IncomingMessageBaseService#set_conversation.
+  # Locked inboxes hold a contact to one thread, so the caller is refused rather than given a second one.
+  def existing_conversation
+    return contact_conversations.first if inbox.lock_to_single_conversation
+
+    # Only threads the caller can open, else a newest-but-hidden thread would block the call.
+    Conversations::PermissionFilterService.new(
+      contact_conversations.where.not(status: :resolved), user, inbox.account
+    ).perform.first
+  end
+
+  def contact_conversations
+    inbox.conversations.where(contact_id: contact.id).order(last_activity_at: :desc)
+  end
+
+  # Unsaved, so callers can authorize the thread a call would open before dialing.
+  def new_conversation
+    inbox.account.conversations.new(inbox: inbox, contact: contact, assignee_id: user.id, status: :open)
+  end
+
+  # Locked so two agents calling the same fresh contact can't open two threads.
+  def perform!
+    contact_inbox = ContactInboxBuilder.new(contact: contact, inbox: inbox).perform
+
+    contact_inbox.with_lock do
+      existing_conversation || new_conversation.tap { |conversation| conversation.update!(contact_inbox: contact_inbox) }
+    end
+  end
+end
diff --git a/enterprise/app/services/whatsapp/call_permission_request_service.rb b/enterprise/app/services/whatsapp/call_permission_request_service.rb
new file mode 100644
index 000000000..65c4f1506
--- /dev/null
+++ b/enterprise/app/services/whatsapp/call_permission_request_service.rb
@@ -0,0 +1,63 @@
+# Meta error 138006 means the contact hasn't opted in to calls yet; send the opt-in template.
+class Whatsapp::CallPermissionRequestService
+  THROTTLE = 5.minutes
+
+  pattr_initialize [:conversation!]
+
+  # Locked so two agents calling the same contact can't both send the template.
+  def perform
+    conversation.with_lock do
+      next 'permission_pending' if throttled?
+
+      sent = send_request_safely
+      next 'failed' if sent.blank?
+
+      record_wamid(sent)
+      emit_activity
+      'permission_requested'
+    end
+  end
+
+  private
+
+  def throttled?
+    last_requested = conversation.additional_attributes&.dig('call_permission_requested_at')
+    last_requested.present? && Time.zone.parse(last_requested) > THROTTLE.ago
+  end
+
+  # Treat transport errors as a falsy return so the caller renders 422 rather than 500.
+  def send_request_safely
+    provider_service.send_call_permission_request(conversation.contact.phone_number.delete('+'), *body_args)
+  rescue StandardError => e
+    Rails.logger.warn "[WHATSAPP CALL] permission_request failed: #{e.class} #{e.message}"
+    nil
+  end
+
+  # Pass the inbox-level override only when present so the provider falls back
+  # to the i18n default for inboxes that haven't customized the prompt.
+  def body_args
+    custom_body = conversation.inbox.channel.provider_config&.dig('call_permission_request_body').presence
+    custom_body ? [custom_body] : []
+  end
+
+  def emit_activity
+    content = I18n.t('conversations.activity.whatsapp_call.permission_requested', contact_name: conversation.contact.name)
+    ::Conversations::ActivityMessageJob.perform_later(
+      conversation,
+      { account_id: conversation.account_id, inbox_id: conversation.inbox_id, message_type: :activity, content: content }
+    )
+  end
+
+  # Stash the outbound wamid so the reply webhook can match context.id back here.
+  def record_wamid(sent)
+    attrs = (conversation.additional_attributes || {}).merge(
+      'call_permission_requested_at' => Time.current.iso8601,
+      'call_permission_request_message_id' => sent.dig('messages', 0, 'id')
+    )
+    conversation.update!(additional_attributes: attrs)
+  end
+
+  def provider_service
+    @provider_service ||= conversation.inbox.channel.provider_service
+  end
+end
diff --git a/enterprise/app/views/api/v1/accounts/whatsapp_calls/initiate.json.jbuilder b/enterprise/app/views/api/v1/accounts/whatsapp_calls/initiate.json.jbuilder
index bdb1fa204..920c5bb7d 100644
--- a/enterprise/app/views/api/v1/accounts/whatsapp_calls/initiate.json.jbuilder
+++ b/enterprise/app/views/api/v1/accounts/whatsapp_calls/initiate.json.jbuilder
@@ -2,4 +2,5 @@ json.status 'calling'
 json.call_id @call.provider_call_id
 json.id @call.id
 json.message_id @message.id
+json.conversation_id @conversation.display_id
 json.provider 'whatsapp'