diff --git a/voxtelesys_integration/public/js/voxtelesys_call_popup.js b/voxtelesys_integration/public/js/voxtelesys_call_popup.js
new file mode 100644
index 0000000..dfa6c57
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+++ b/voxtelesys_integration/public/js/voxtelesys_call_popup.js
@@ -0,0 +1,117 @@
+/**
+ * voxtelesys_call_popup.js
+ * Overrides frappe.phone_call.handler for click-to-call via Voxtelesys.
+ * Subscribes to realtime events for incoming call popup + active call bar.
+ */
+(function () {
+  "use strict";
+
+  frappe.after_ajax(function () {
+    if (!frappe.boot.voxtelesys || !frappe.boot.voxtelesys.enabled) return;
+    VoxtelesysPhone.init();
+  });
+
+  const VoxtelesysPhone = {
+    activeCallLog: null, popup: null, _popupTimeout: null,
+
+    init() {
+      this._overridePhoneCallHandler();
+      this._subscribeRealtime();
+      console.log("[Voxtelesys] Telephony provider initialised.");
+    },
+
+    _overridePhoneCallHandler() {
+      frappe.phone_call = {
+        handler: (phoneNumbers, frm) => {
+          const numbers = Array.isArray(phoneNumbers) ? phoneNumbers : [phoneNumbers];
+          if (numbers.length === 1) { VoxtelesysPhone.dialNumber(numbers[0], frm); }
+          else { VoxtelesysPhone._showNumberPicker(numbers, frm); }
+        },
+      };
+    },
+
+    dialNumber(number, frm) {
+      const args = { to: number, from_: frappe.boot.voxtelesys.caller_id || "" };
+      if (frm && frm.doc) { args.reference_doctype = frm.doctype; args.reference_name = frm.docname; }
+      frappe.call({
+        method: "voxtelesys_integration.api.voxtelesys.make_outbound_call",
+        args,
+        callback: (r) => {
+          if (r.message && r.message.ok) {
+            VoxtelesysPhone._showCallBar({ direction: "Outbound", number, callLog: r.message.call_log, callSid: r.message.call_sid });
+          } else {
+            frappe.msgprint({ title: __("Call Failed"), message: __("Could not place call. Check Voxtelesys settings."), indicator: "red" });
+          }
+        },
+      });
+    },
+
+    _subscribeRealtime() {
+      frappe.realtime.on("voxtelesys_call_initiated", (data) => {
+        if (data.direction === "Inbound") VoxtelesysPhone._showIncomingCallPopup(data);
+      });
+      frappe.realtime.on("voxtelesys_call_disconnected", (data) => {
+        VoxtelesysPhone._handleCallDisconnected(data);
+      });
+    },
+
+    _showIncomingCallPopup(data) {
+      if (this.popup && this.popup.call_sid === data.call_sid) return;
+      this.popup = new frappe.ui.Dialog({
+        title: __("Incoming Call"),
+        fields: [{ fieldtype: "HTML", fieldname: "call_info", options: `
+          <div class="vtx-incoming-call">
+            <div class="vtx-phone-icon">📞</div>
+            <div class="vtx-caller">${frappe.utils.escape_html(data.from || "Unknown")}</div>
+            <div class="vtx-call-time vtx-blink">Ringing…</div>
+          </div>` }],
+        primary_action_label: __("Open Call Log"),
+        primary_action: () => { frappe.set_route("Form", "Voxtelesys Call Log", data.call_log); this.popup.hide(); },
+      });
+      this.popup.call_sid = data.call_sid;
+      this.popup.$wrapper.find(".modal-footer").prepend(`<button class="btn btn-default vtx-dismiss-btn">${__("Dismiss")}</button>`);
+      this.popup.$wrapper.find(".vtx-dismiss-btn").on("click", () => this.popup.hide());
+      this.popup.show();
+      this._popupTimeout = setTimeout(() => { if (this.popup) this.popup.hide(); }, 60000);
+    },
+
+    _showCallBar({ direction, number, callLog }) {
+      this._removeCallBar();
+      this.activeCallLog = callLog;
+      const bar = document.createElement("div");
+      bar.id = "vtx-call-bar";
+      bar.innerHTML = `<div class="vtx-call-bar-inner">
+        <span class="vtx-call-direction">${direction === "Outbound" ? "📤" : "📥"}</span>
+        <span class="vtx-call-number">${frappe.utils.escape_html(number)}</span>
+        <span class="vtx-call-status" id="vtx-status-label">Connecting…</span>
+        <button class="btn btn-xs btn-default vtx-open-log-btn">Open Log</button>
+        <button class="btn btn-xs btn-danger vtx-hangup-btn">End Call</button>
+      </div>`;
+      bar.querySelector(".vtx-open-log-btn").addEventListener("click", () => frappe.set_route("Form", "Voxtelesys Call Log", callLog));
+      bar.querySelector(".vtx-hangup-btn").addEventListener("click", () => VoxtelesysPhone._removeCallBar());
+      document.body.appendChild(bar);
+    },
+
+    _removeCallBar() { const el = document.getElementById("vtx-call-bar"); if (el) el.remove(); this.activeCallLog = null; },
+
+    _handleCallDisconnected(data) {
+      const lbl = document.getElementById("vtx-status-label");
+      if (lbl && this.activeCallLog === data.call_log) {
+        lbl.textContent = `${data.status || "Ended"} · ${data.duration ? data.duration + "s" : ""}`;
+        setTimeout(() => VoxtelesysPhone._removeCallBar(), 4000);
+      }
+      if (this.popup && this.popup.call_sid === data.call_sid) { clearTimeout(this._popupTimeout); this.popup.hide(); }
+    },
+
+    _showNumberPicker(numbers, frm) {
+      const d = new frappe.ui.Dialog({
+        title: __("Select Number to Call"),
+        fields: numbers.map((num, idx) => ({ fieldtype:"Button", fieldname:`num_${idx}`, label:num,
+          click: () => { d.hide(); VoxtelesysPhone.dialNumber(num, frm); } })),
+      });
+      d.show();
+    },
+  };
+
+  window.VoxtelesysPhone = VoxtelesysPhone;
+})();
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